Western United States - wikipedia Western United States `` American West '' redirects here. For the similarly named airline, see America West Airlines. For the 2016 television show, see The American West. `` Western territories '' redirects here. For the part of Poland, see Recovered Territories. For the western territories of other countries and continents, see West ( disambiguation ). Region in Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming, United States Western United States Region American West, Far West, or the West Regional definitions vary from source to source. This map reflects the Western United States as defined by the Census Bureau. In turn, this region is sub-divided into Mountain and Pacific areas. Country United States States Alaska Arizona California Colorado Hawaii Idaho Montana Nevada New Mexico Oregon Utah Washington Wyoming The Western United States, commonly referred to as the American West, the Far West, or simply the West, traditionally refers to the region comprising the westernmost states of the United States. Because European settlement in the U.S. expanded westward after its founding, the meaning of the West has evolved over time. Prior to about 1800, the crest of the Appalachian Mountains was seen as the western frontier. Since then, the frontier generally moved westward and eventually, the lands west of the Mississippi River came to be referred to as the West. Though no consensus exists, even among experts, for the definition of the West as a region, the U.S. Census Bureau 's definition of the 13 westernmost states includes the Rocky Mountains and the Great Basin to the West Coast, and the outlying states of Hawaii and Alaska. The West contains several major biomes. It is known for arid to semi-arid plateaus and plains, particularly in the American Southwest -- forested mountains, including the major ranges of the American Sierra Nevada and Rocky Mountains -- the massive coastal shoreline of the American Pacific Coast -- and the rainforests of the Pacific Northwest. Contents 1 Defining the West 1.1 Subregions 1.2 Outlying areas 2 Demographics 3 Natural geography 3.1 Climate and agriculture 3.2 Geology 4 History 4.1 20th century 5 Culture 6 Major metropolitan areas 6.1 Other population centers 7 Politics 8 Health 9 See also 10 References 11 Further reading 12 External links Defining the West This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( August 2015 ) While the West is defined by many cultures, the American cowboy is often seen as iconic of the region, here portrayed by C.M. Russell. The West, as the most recent part of the United States, is often known for broad highways and freeways and open space. Pictured is a road in Utah to Monument Valley. The Western U.S. is the largest region of the country, covering more than half the land area of the United States. It is also the most geographically diverse, incorporating geographic regions such as the temperate rainforests of the Northwest, the highest mountain ranges ( including the Rocky Mountains, and the Sierra Nevada ), the Great Plains, and all of the desert areas located in the United States ( the Mojave, Sonoran, Great Basin, and Chihuahuan deserts ). Given this expansive and diverse geography it is no wonder the region is difficult to specifically define. Sensing a possible shift in the popular understanding of the West as a region in the early 1990s, historian Walter Nugent conducted a survey of three groups of professionals with ties to the region : a large group of Western historians ( 187 respondents ), and two smaller groups, 25 journalists and publishers and 39 Western authors. A majority of the historian respondents placed the eastern boundary of the West east of the Census definition out on the eastern edge of the Great Plains or on the Mississippi River. The survey respondents as a whole showed just how little agreement there was on the boundaries of the West. Subregions Within a region as large and diverse as the Western United States, smaller areas with more closely shared demographics and geography have developed as subregions. The region is split into two smaller units, or divisions, by the U.S. Census Bureau : Mountain States Montana, Wyoming, Colorado, New Mexico, Idaho, Utah, Arizona, and Nevada Pacific States Washington, Oregon, California, Alaska, and Hawaii Other classifications distinguish between Southwest and Northwest. Arizona, New Mexico, Nevada, Colorado and Utah are typically considered to be part of the Southwest, though Texas and Oklahoma are frequently considered part of the Southwest as well. Meanwhile, the states of Idaho, Montana, Oregon and Washington can be considered part of the Northwest or Pacific Northwest. The term West Coast is commonly used to refer to just California, Oregon and Washington, whereas Alaska and Hawaii are more geographically isolated from the other states of the region and do not necessarily fit in any of these subregions. State 2017 Estimate 2010 Census Change Area Density Arizona 7,016,270 6,392,017 7000976613485226960 ♠ + 9.77 % 113,591.04 sq mi ( 294,199.4 km ) 62 / sq mi ( 24 / km ) Colorado 5,607,154 5,029,196 7001114920555890050 ♠ + 11.49 % 103,641.81 sq mi ( 268,431.1 km ) 54 / sq mi ( 21 / km ) Idaho 1,716,943 1,567,582 7000952811399977800 ♠ + 9.53 % 82,643.05 sq mi ( 214,044.5 km ) 21 / sq mi ( 8 / km ) Montana 1,050,493 989,415 7000617314271564510 ♠ + 6.17 % 145,545.69 sq mi ( 376,961.6 km ) 7 / sq mi ( 3 / km ) Nevada 2,998,039 2,700,551 7001110158260295769 ♠ + 11.02 % 109,781.09 sq mi ( 284,331.7 km ) 27 / sq mi ( 11 / km ) New Mexico 2,088,070 2,059,179 7000140303489886020 ♠ + 1.40 % 121,455.60 sq mi ( 314,568.6 km ) 17 / sq mi ( 7 / km ) Utah 3,101,833 2,763,885 7001122272815258230 ♠ + 12.23 % 82,169.56 sq mi ( 212,818.2 km ) 38 / sq mi ( 15 / km ) Wyoming 579,315 563,626 7000278358344008259 ♠ + 2.78 % 97,093.07 sq mi ( 251,469.9 km ) 6 / sq mi ( 2 / km ) Rocky Mountain 24,153,521 22,065,451 7000946307419685190 ♠ + 9.46 % 855,920.91 sq mi ( 2,216,825.0 km ) 28 / sq mi ( 11 / km ) Alaska 739,795 710,231 7000416258935473110 ♠ + 4.16 % 570,640.51 sq mi ( 1,477,952.1 km ) 1 / sq mi ( 1 / km ) California 39,536,653 37,253,956 7000612739490002080 ♠ + 6.13 % 155,779.10 sq mi ( 403,466.0 km ) 254 / sq mi ( 98 / km ) Hawaii 1,427,538 1,360,301 7000494280310019620 ♠ + 4.94 % 6,422.62 sq mi ( 16,634.5 km ) 222 / sq mi ( 86 / km ) Oregon 4,142,776 3,831,074 7000813615189891920 ♠ + 8.14 % 95,987.94 sq mi ( 248,607.6 km ) 43 / sq mi ( 17 / km ) Washington 7,405,743 6,724,540 7001101301055536880 ♠ + 10.13 % 66,455.47 sq mi ( 172,118.9 km ) 111 / sq mi ( 43 / km ) Pacific 53,252,505 49,880,102 7000676101865228740 ♠ + 6.76 % 895,285.64 sq mi ( 2,318,779.2 km ) 59 / sq mi ( 23 / km ) Total 77,406,026 71,945,553 7000758972969462060 ♠ + 7.59 % 1,751,205.6 sq mi ( 4,535,602 km ) 44 / sq mi ( 17 / km ) Outlying areas West Texas in the Chihuahuan Desert may be considered as part of the Western U.S., as from a climatological perspective the West might be said to begin just west of Austin where annual rainfall drops off significantly from what is typically experienced in the East, with a concurrent change in plant and animal species. Fort Worth has long laid claim to be `` Where the West Begins. '' Demographics The population distribution by race in the Western United States ( 2010 ) : 66.4 % Non-Hispanic Whites 28.6 % were Hispanic or Latino ( of any race ) 9.3 % Asian 4.8 % Black or African American 1.9 % American Indian or Alaska Native 12.4 % Some other race As defined by the United States Census Bureau, the Western region of the United States includes 13 states with a total 2013 estimated population of 74,254,423. The West is still one of the most sparsely settled areas in the United States with 49.5 inhabitants per square mile ( 19 / km2 ). Only Texas with 78.0 inhabitants / sq mi. ( 30 / km2 ), Washington with 86.0 inhabitants / sq mi. ( 33 / km2 ), and California with 213.4 inhabitants / sq mi. ( 82 / km2 ) exceed the national average of 77.98 inhabitants / sq mi. ( 30 / km2 ). These maps from the 2000 US Census highlight differences from state to state of three minority groups. Note that most of the American Indian, Hispanic, and Asian population is in the West. The entire Western region has also been strongly influenced by European, Hispanic or Latino, Asian and Native Americans ; it contains the largest number of minorities in the U.S. While most of the studies of racial dynamics in America such as riots in Los Angeles have been written about European and African Americans, in many cities in the West and California, Whites and Blacks together are less than half the population because of the preference for the region by Hispanics and Asians. African and European Americans, however, continue to wield a stronger political influence because of the lower rates of citizenship and voting among Asians and Hispanics. The West also contains much of the Native American population in the U.S., particularly in the large reservations in the Mountain and Desert States. The largest concentrations for African Americans in the West can be found in San Diego, Los Angeles, Oakland, Sacramento, San Francisco, Seattle, Tacoma, Phoenix, Las Vegas, Denver, and Colorado Springs. The Western United States has a higher sex ratio ( more males than females ) than any other region in the United States. Because the tide of development had not yet reached most of the West when conservation became a national issue, agencies of the federal government own and manage vast areas of land. ( The most important among these are the National Park Service and the Bureau of Land Management within the Interior Department, and the U.S. Forest Service within the Agriculture Department. ) National parks are reserved for recreational activities such as fishing, camping, hiking, and boating, but other government lands also allow commercial activities like ranching, logging, and mining. In recent years, some local residents who earn their livelihoods on federal land have come into conflict with the land 's managers, who are required to keep land use within environmentally acceptable limits. The largest city in the region is Los Angeles, located on the West Coast. Other West Coast cities include San Diego, San Bernardino, San Jose, San Francisco, Oakland, Bakersfield, Sacramento, Seattle, Tacoma, and Portland. Prominent cities in the Mountain States include Denver, Colorado Springs, Phoenix, Tucson, Albuquerque, Las Vegas, Salt Lake City, Boise, El Paso, and Billings. Natural geography The geography of the Western United States is split into three major physiographic divisions : the Rocky Mountain System ( areas 16 - 19 on map ), the Intermontane Plateaus ( 20 - 22 ), and the Pacific Mountain System ( 23 - 25 ). Arid regions of the Western United States as mapped in 1893 Zion National Park in southern Utah is one of five national parks in the state. Big Sur, California The High Desert region of Oregon The Mojave Desert covers much of the Southwestern United States, stretching from Nevada into California, Arizona, and Utah. Pryor Mountains in Montana, feral horses Great Sand Dunes National Park in Colorado Grand Canyon, Arizona Along the Pacific Ocean coast lie the Coast Ranges, which, while not approaching the scale of the Rocky Mountains, are formidable nevertheless. They collect a large part of the airborne moisture moving in from the ocean. East of the Coast Ranges lie several cultivated fertile valleys, notably the San Joaquin and Sacramento valleys of California and the Willamette Valley of Oregon. Beyond the valleys lie the country boys in Sierra Nevada in the south and the Cascade Range in the north. Mount Whitney, at 14,505 feet ( 4,421 m ) the tallest peak in the contiguous 48 states, is in the Sierra Nevada. The Cascades are also volcanic. Mount Rainier, a volcano in Washington, is also over 14,000 feet ( 4,300 m ). Mount St. Helens, a volcano in the Cascades erupted explosively in 1980. A major volcanic eruption at Mount Mazama around 4860 BC formed Crater Lake. These mountain ranges see heavy precipitation, capturing most of the moisture that remains after the Coast Ranges, and creating a rain shadow to the east forming vast stretches of arid land. These dry areas encompass much of Nevada, Utah, and Arizona. The Mojave Desert and Sonoran Desert along with other deserts are found here. Beyond the deserts lie the Rocky Mountains. In the north, they run almost immediately east of the Cascade Range, so that the desert region is only a few miles wide by the time one reaches the Canada -- US border. The Rockies are hundreds of miles ( kilometers ) wide, and run uninterrupted from New Mexico to Alaska. The Rocky Mountain Region is the highest overall area of the United States, with an average elevation of above 4,000 feet ( 1,200 m ). The tallest peaks of the Rockies, 54 of which are over 14,000 feet ( 4,300 m ), are found in central and western Colorado. The West has several long rivers that empty into the Pacific Ocean, while the eastern rivers run into the Gulf of Mexico. The Mississippi River forms the easternmost possible boundary for the West today. The Missouri River, a tributary of the Mississippi, flows from its headwaters in the Rocky Mountains eastward across the Great Plains, a vast grassy plateau, before sloping gradually down to the forests and hence to the Mississippi. The Colorado River snakes through the Mountain states, at one point forming the Grand Canyon. The Colorado River is a major source of water in the Southwest and many dams, such as the Hoover Dam, form reservoirs along it. So much water is drawn for drinking water throughout the West and irrigation in California that in most years, water from the Colorado River no longer reaches the Gulf of California. The Columbia River, the largest river in volume flowing into the Pacific Ocean from North America, and its tributary, the Snake River, water the Pacific Northwest. The Platte runs through Nebraska and was known for being a mile ( 2 km ) wide but only a half - inch ( 1 cm ) deep. The Rio Grande forms the border between Texas and Mexico before turning due north and splitting New Mexico in half. According to the United States Coast Guard, `` The Western Rivers System consists of the Mississippi, Ohio, Missouri, Illinois, Tennessee, Cumberland, Arkansas, and White Rivers and their tributaries, and certain other rivers that flow towards the Gulf of Mexico. '' Climate and agriculture Most of the public land held by the U.S. National Forest Service and Bureau of Land Management is in the Western states. Public lands account for 25 to 75 percent of the total land area in these states. As a generalization, the climate of the West can be described as semi-arid ; however, parts of the West get extremely high amounts of rain and / or snow, and still other parts are true desert and get less than 5 inches ( 130 mm ) of rain per year. Also, the climate of the West is quite unstable, as areas that are normally wet can be very dry for years and vice versa. The seasonal temperatures vary greatly throughout the West. Low elevations on the West Coast have warm summers and mild winters with little to no snow. The desert southwest has very hot summers and mild winters. While the mountains in the southwest receive generally large amounts of snow. The Inland Northwest has a continental climate of warm to hot summers and cold to bitter cold winters. Annual rainfall is greater in the eastern portions, gradually tapering off until reaching the Pacific Coast where it increases again. In fact, the greatest annual rainfall in the United States falls in the coastal regions of the Pacific Northwest. Drought is much more common in the West than the rest of the United States. The driest place recorded in the U.S. is Death Valley, California. Violent thunderstorms occur east of the Rockies. Tornadoes occur every spring on the southern plains, with the most common and most destructive centered on Tornado Alley, which covers eastern portions of the West, ( Texas to North Dakota ), and all states in between and to the east. Agriculture varies depending on rainfall, irrigation, soil, elevation, and temperature extremes. The arid regions generally support only livestock grazing, chiefly beef cattle. The wheat belt extends from Texas through The Dakotas, producing most of the wheat and soybeans in the U.S. and exporting more to the rest of the world. Irrigation in the Southwest allows the growing of great quantities of fruits, nuts, and vegetables as well as grain, hay, and flowers. Texas is a major cattle and sheep raising area, as well as the nation 's largest producer of cotton. Washington is famous for its apples, and Idaho for its potatoes. California and Arizona are major producers of citrus crops, although growing metropolitan sprawl is absorbing much of this land. Local and state government officials started to understand, after several surveys made during the latter part of the 19th century, that only action by the federal government could provide water resources needed to support the development of the West. Starting in 1902, Congress passed a series of acts authorizing the establishment of the United States Bureau of Reclamation to oversee water development projects in seventeen western states. During the first half of the 20th century, dams and irrigation projects provided water for rapid agricultural growth throughout the West and brought prosperity for several states, where agriculture had previously only been subsistence level. Following World War II, the West 's cities experienced an economic and population boom. The population growth, mostly in the Southwest states of New Mexico, Utah, Colorado, Arizona, and Nevada, has strained water and power resources, with water diverted from agricultural uses to major population centers, such as the Las Vegas Valley and Los Angeles. Geology Plains make up much of the eastern portion of the West, underlain with sedimentary rock from the Upper Paleozoic, Mesozoic, and Cenozoic eras. The Rocky Mountains expose igneous and metamorphic rock both from the Precambrian and from the Phanerozoic eon. The Inter-mountain States and Pacific Northwest have huge expanses of volcanic rock from the Cenozoic era. Salt flats and salt lakes reveal a time when the great inland seas covered much of what is now the West. The Pacific states are the most geologically active areas in the United States. Earthquakes cause damage every few to several years in California. While the Pacific states are the most volcanically active areas, extinct volcanoes and lava flows are found throughout most of the West. History Main articles : American frontier and Timeline of the American Old West The Western United States has been populated by Native Americans since at least 11,000 years ago, when the first Paleo - Indians arrived. Pre-Columbian trade routes to kingdoms and empires such as the Mound Builders existed in places such as Yellowstone National Park since around 1000 AD. Major settlement of the western territories developed rapidly in the 1840s, largely through the Oregon Trail and the California Gold Rush of 1849. California experienced such a rapid growth in a few short months that it was admitted to statehood in 1850 without the normal transitory phase of becoming an official territory. One of the largest migrations in American history occurred in the 1840s as the Latter Day Saints left the Midwest to build a theocracy in Utah. Both Omaha, Nebraska and St. Louis, Missouri laid claim to the title, `` Gateway to the West '' during this period. Omaha, home to the Union Pacific Railroad and the Mormon Trail, made its fortunes on outfitting settlers ; St. Louis built itself upon the vast fur trade in the West before its settlement. The 1850s were marked by political battles over the expansion of slavery into the western territories, issues leading to the Civil War. The history of the American West in the late 19th and early 20th centuries has acquired a cultural mythos in the literature and cinema of the United States. The image of the cowboy, the homesteader, and westward expansion took real events and transmuted them into a myth of the west which has shaped much of American popular culture since the late 19th century. Writers as diverse as Bret Harte and Zane Grey celebrated or derided cowboy culture, while artists such as Frederic Remington created western art as a method of recording the expansion into the west. The American cinema, in particular, created the genre of the western movie, which, in many cases, use the West as a metaphor for the virtue of self - reliance and an American ethos. The contrast between the romanticism of culture about the West and the actuality of the history of the westward expansion has been a theme of late 20th and early 21st century scholarship about the West. Cowboy culture has become embedded in the American experience as a common cultural touchstone, and modern forms as diverse as country and western music have celebrated the sense of isolation and independence of spirit inspired by the frontiersmen on virgin land. 20th century The advent of the automobile enabled the average American to tour the West. Western businessmen promoted Route 66 as a means to bring tourism and industry to the West. In the 1950s, representatives from all the western states built the Cowboy Hall of Fame and Western Heritage Center to showcase western culture and greet travelers from the East. During the latter half of the 20th century, several transcontinental interstate highways crossed the West bringing more trade and tourists from the East. Oil boom towns in Texas and Oklahoma rivaled the old mining camps for their rawness and wealth. The Dust Bowl forced children of the original homesteaders even further west. The movies became America 's chief entertainment source featuring western fiction, later the community of Hollywood in Los Angeles became the headquarters of the mass media such as radio and television production. California has emerged as the most populous state and one of the top 10 economies in the world. Massive late 19th - 20th century population and settlement booms created two megalopolis areas of the Greater Los Angeles / Southern California and the San Francisco Bay Area / Northern California regions, one of the nation 's largest metropolitan areas and in the top 25 largest urban areas in the world. Four more metropolitan areas of San Bernardino - Riverside, San Diego, Denver, Phoenix, and Seattle have over a million residents, while the three fastest growing metro areas were the Salt Lake City metropolitan area, the Las Vegas metropolitan area ; and the Portland metropolitan area. Although there has been segregation, along with accusations of racial profiling and police brutality towards minorities due to issues such as illegal immigration and a racial shift ( i.e. White flight and now black flight ) in neighborhood demographics, sometimes leading to racially based riots ( i.e. the 1992 Los Angeles Riots and 1965 Watts Riots ), the West has a continuing reputation for being open - minded and for being one of the most racially progressive areas in the United States. Los Angeles has the largest Mexican population outside of Mexico, while San Francisco has the largest Chinese community in North America and also has a large LGBT community, and Oakland, California has a large percentage of residents being African - American, as well as Long Beach, California which also has a large Black community. The state of Utah has a Mormon majority ( estimated at 62.4 % in 2004 ), while some cities like Albuquerque, New Mexico ; Billings, Montana ; Spokane, Washington ; and Tucson, Arizona are located near Indian Reservations. In remote areas there are settlements of Alaskan Natives and Native Hawaiians. Culture Facing both the Pacific Ocean and the Mexican border, the West has been shaped by a variety of ethnic groups. Hawaii is the only state in the union in which Asian Americans outnumber white American residents. Asians from many countries have settled in California and other coastal states in several waves of immigration since the 19th century, contributing to the Gold Rush, the building of the transcontinental railroad, agriculture, and more recently, high technology. The border states -- California, Arizona, New Mexico, and Texas -- and other southwestern states such as Colorado, Utah, and Nevada all have large Hispanic populations, and the many Spanish place names attest to their history as former Spanish and Mexican territories. Mexican - Americans have also had a growing population in Northwestern states of Oregon and Washington, as well as the southern states of Texas and Oklahoma. Hollywood is a well - known area of Los Angeles and the symbolic center of the American film industry. Alaska -- the northernmost state in the Union -- is a vast land of few people, many of them native, and of great stretches of wilderness, protected in national parks and wildlife refuges. Hawaii 's location makes it a major gateway between the United States and Asia, as well as a center for tourism. In the Pacific Coast states, the wide areas filled with small towns, farms, and forests are supplemented by a few big port cities which have evolved into world centers for the media and technology industries. Now the second largest city in the nation, Los Angeles is best known as the home of the Hollywood film industry ; the area around Los Angeles also was a major center for the aerospace industry by World War II, though Boeing, located in Washington State would lead the aerospace industry. Fueled by the growth of Los Angeles, as well as the San Francisco Bay area, including Silicon Valley, the center of America 's high tech industry, California has become the most populous of all the 50 states. Oregon and Washington have also seen rapid growth with the rise of Boeing and Microsoft along with agriculture and resource based industries. The desert and mountain states have relatively low population densities, and developed as ranching and mining areas which are only recently becoming urbanized. Most of them have highly individualistic cultures, and have worked to balance the interests of urban development, recreation, and the environment. Newspaper Rock State Historic Monument, Utah, contains petroglyphs left by the first inhabitants of the American Southwest. Culturally distinctive points include the large Mormon population in the Mormon Corridor, including southeastern Idaho, Utah, Northern Arizona, and Nevada ; the extravagant casino resort towns of Las Vegas and Reno, Nevada ; and the numerous American Indian tribal reservations. Major metropolitan areas These are the largest Metropolitan Statistical Areas ( MSA ) with a population above 500,000 in the 13 Western states with population estimates as of July 1, 2015 as defined by the United States Census Bureau : Rank ( West ) Rank ( USA ) MSA Population State ( s ) Los Angeles - Long Beach - Anaheim MSA 13,340,068 California 11 San Francisco - Oakland - Hayward MSA 4,656,132 California 12 Phoenix - Mesa - Scottsdale MSA 4,574,531 Arizona 13 San Bernardino - Riverside - Ontario MSA 4,489,159 California 5 15 Seattle - Tacoma - Bellevue MSA 3,733,580 Washington 6 17 San Diego - Carlsbad MSA 3,299,521 California 7 19 Denver - Aurora - Lakewood MSA 2,814,330 Colorado 8 23 Portland - Vancouver - Hillsboro MSA 2,389,228 Oregon Washington 9 27 Sacramento - Roseville - Arden - Arcade MSA 2,274,194 California 10 29 Las Vegas - Henderson - Paradise MSA 2,114,801 Nevada 11 35 San Jose - Sunnyvale - Santa Clara San Jose - Sunnyvale - Santa Clara, CA Metropolitan Statistical Area 1,976,836 California 12 48 Salt Lake City MSA 1,170,266 Utah 13 53 Tucson MSA 1,010,025 Arizona 14 54 Honolulu MSA 998,714 Hawaii 15 56 Fresno MSA 974,861 California 16 60 Albuquerque MSA 907,301 New Mexico 17 61 Bakersfield - Delano MSA 882,176 California 18 66 Oxnard - Thousand Oaks - Ventura MSA 850,536 California 19 77 Stockton - Lodi MSA 726,106 California 20 80 Colorado Springs MSA 697,856 Colorado 21 81 Boise City MSA 676,909 Idaho 22 86 Ogden - Clearfield MSA 642,850 Utah 23 93 Provo - Orem MSA 585,799 Utah 24 100 Spokane - Spokane Valley MSA 547,824 Washington 25 102 Modesto MSA 538,388 California 26 106 Santa Rosa MSA 502,146 California Other population centers The MSA of El Paso, Texas, although belonging to a state considered part of the Southern United States, is sometimes also considered part of the Western United States. Its estimated population is 838,972. The Mexican border cities of Tijuana ( part of the San Diego MSA ) and Mexicali ( part of the Yuma, AZ - El Centro, CA MSA ) in the Mexican state of Baja California. The Canadian border cities of Vancouver, British Columbia and Victoria, British Columbia ( the nearest US cities are Bellingham and Port Angeles, both in Washington ). The largest MSA in Alaska is Anchorage ; it has an estimated population of 399,790, as of July 2015. Politics States where state - level laws allowed legalized medicinal marijuana before 2005 States with legalized physician - assisted suicide States that have no income tax at the state level Further information : Coastal California § Politics, and Left Coast The region 's distance from historical centers of power in the East, and the celebrated `` frontier spirit '' of its settlers offer two clichés for explaining the region 's independent, heterogeneous politics. Historically, the West was the first region to see widespread women 's suffrage, with women casting votes in Utah and Wyoming as early as 1870, five decades before the 19th Amendment was ratified by the nation. California birthed both the property rights and conservation movements, and spawned such phenomena as the Taxpayer Revolt and the Berkeley Free Speech Movement. It has also produced three presidents : Herbert Hoover, Richard Nixon, and Ronald Reagan. The prevalence of libertarian political attitudes is widespread. For example, the majority of Western states have legalized medicinal marijuana ( all but Utah and Wyoming ) and some forms of gambling ( except Utah ) ; Oregon, Washington, and Montana have legalized physician - assisted suicide ; most rural counties in Nevada allow licensed brothels, and voters in Alaska, Colorado, Nevada, California, Oregon, and Washington have legalized recreational use of marijuana. The West Coast and Hawaii lean toward the Democratic Party. San Francisco 's two main political parties are the Green Party and the Democratic Party. Seattle has historically been a center of radical left - wing politics. One of the Democratic leaders of the Congress is from the region : House Minority Leader Nancy Pelosi of California. Alaska and the Mountain States are more Republican, with Alaska, Arizona, Idaho, Montana, Utah, and Wyoming being Republican strongholds, and Colorado and Nevada being swing states. The state of Nevada is considered a political bellwether, having correctly voted for every president except twice ( in 1976 and 2016 ) since 1912. New Mexico too is considered a bellwether, having voted for the popular vote winner in every presidential election since statehood, except in 1976. The state of Arizona has been won by the Republican presidential candidate in every election except one since 1948, while the states of Idaho, Utah, and Wyoming have been won by the Republican presidential candidate in every election since 1964. Wyoming, Idaho, and Utah have been some of the country 's most Republican states. As the fastest - growing demographic group, after Asians, Latinos are hotly contested by both parties. Immigration is an important political issue for this group. Backlash against illegal aliens led to the passage of California Proposition 187 in 1994, a ballot initiative which would have denied many public services to illegal aliens. Association of this proposal with California Republicans, especially incumbent governor Pete Wilson, drove many Hispanic voters to the Democrats. Health The Western United States consistently ranks well in health measures. The rate of potentially preventable hospitalizations in the Western United States was consistently lower than other regions from 2005 to 2011. While the proportion of maternal or neonatal hospital stays was higher in the Western United States relative to other regions, the proportion of medical stays in hospitals was lower than in other regions in 2012. See also Art of the West ( magazine ) Autry Museum of the American West California cuisine Folklore of the United States High Country News History of the west coast of North America History of the Jews in the American West Intermountain West Sunset magazine Professional sports in the Western United States Territories of the United States on stamps Western Canada Western White House References ^ Jump up to : `` Census Regions and Divisions of the United States '' ( PDF ). U.S. Census Bureau. U.S. Census Bureau. Retrieved 25 November 2014. Jump up ^ Jody Halsted ( 31 July 2014 ). `` On the road along the Mississippi River ''. Foxnews. 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Brands, The Age of Gold : The California Gold Rush and the New American Dream ( 2002 ) Jump up ^ Michael Morrison, Slavery and the American West : The Eclipse of Manifest Destiny and the Coming of the Civil War ( 1997 ) Jump up ^ Gary J. Hausladen, Western Places, American Myths : How We Think About The West ( U. of Nevada Press, 2006 ) Jump up ^ Henry Nash Smith, Virgin Land : The American West as Symbol and Myth ( Harvard University Press, 1950 ) Jump up ^ Donald Worster, Dust bowl : the southern plains in the 1930s ( Oxford University Press, 1982 ) Jump up ^ Allen John Scott, On Hollywood : The place, the industry ( Princeton University Press, 2005 ) Jump up ^ Lawrence Larsen, The urban West at the end of the frontier ( 1978 ). Jump up ^ Earl Pomeroy, American Far West in the Twentieth Century ( Yale University Press, 2008 ) Jump up ^ Canham, Matt ( July 24, 2005 ). `` Mormon Portion of Utah Population Steadily Shrinking ''. The Salt Lake Tribune. Retrieved February 23, 2012. ^ Jump up to : `` Annual Estimates of the Resident Population : April 1, 2010 to July 1, 2015 ''. United States Census Bureau, Population Division. March 2016. Retrieved 28 June 2016. Jump up ^ `` Estimates of Resident Population Change and Rankings : July 1, 2014 to July 1, 2015 ''. United States Census Bureau, Population Division. March 2016. Retrieved 28 June 2016. Jump up ^ `` Slate ''. 5 November 2014. Jump up ^ Stephen D. Cummings and Patrick B. Reddy, California after Arnold ( 2009 ) pp 165 - 70 Jump up ^ Torio CM, Andrews RM ( September 2014 ). `` Geographic Variation in Potentially Preventable Hospitalizations for Acute and Chronic Conditions, 2005 - 2011 ''. HCUP Statistical Brief # 178. Rockville, MD : Agency for Healthcare Research and Quality. Jump up ^ Wiess, AJ and Elixhauser A ( October 2014 ). `` Overview of Hospital Utilization, 2012 ''. HCUP Statistical Brief # 180. Rockville, MD : Agency for Healthcare Research and Quality. Further reading Beck, Warren A., Haase, Ynez D. ; Historical Atlas of the American West. Norman, OK : University of Oklahoma Press, 1989. Everett, Derek R. Creating the American West : Boundaries and Borderlands. Norman, OK : University of Oklahoma Press, 2014. Lamar, Howard. The New Encyclopedia of the American West. New Haven, CT : Yale University Press, 1998. Milner II, Clyde A ; O'Connor, Carol A. ; Sandweiss, Martha A. The Oxford History of the American West. Oxford University Press, 1994. Phillips, Charles ; Axlerod, Alan ; editor. The Encyclopedia of the American West. New York : Simon & Schuster, 1996. Pomeroy, Earl. The American Far West in the Twentieth Century. New Haven, CT : Yale University Press, 2009. Turner, Frederick Jackson. Rereading Frederick Jackson Turner : ' The Significance of the Frontier in American History ' and Other Essays. New Haven, CT : Yale University Press, 1998. White, Richard. `` It 's Your Misfortune and None of My Own '' : A New History of the American West. Norman, OK : University of Oklahoma Press, 1991. 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Question: where does the west start in the us
Answer: the Rocky Mountains and the Great Basin