Question: Which US state is considered part of the Western States, the Mountain States, southern Great Plains States, and Southwestern States?
Context: Flaveria campestris, common name alkali yellowtops, is a plant species native to the southwestern United States and to the southern Great Plains (Arizona, Utah, New Mexico, Colorado, Texas, Missouri, Kansas, Oklahoma, Missouri).  It is found on saline soils and on the margins of lakes, ponds and streams. U.S. Route 85 (US 85) is a north–south United States highway that runs for 1,479 mi in the Mountain – Northern Plains states of the United States.  The southern terminus of the route is at the Mexico–US border in El Paso, Texas, connecting with Mexican Federal Highway 45.  The northern terminus is at the Canada–US border in Fortuna, North Dakota, where the route continues north as Saskatchewan Highway 35.  In both the United States and Saskatchewan, Canada the route is known as the CanAm Highway.  Sections of US 85 are considered part of the Theodore Roosevelt Expressway. The depopulation of the Great Plains refers to the large-scale migration of people from rural areas of the Great Plains of the United States to more urban areas and to the east and west coasts during the 20th century.  This phenomenon of rural-to-urban migration has occurred to some degree in most areas of the United States, but has been especially pronounced in the Great Plains states, including Texas, Oklahoma, Kansas, Nebraska, South Dakota, North Dakota, Montana, Wyoming, Colorado, and New Mexico where many counties have lost more than 60 percent of their former populations. Arizona ( ; Navajo: "Hoozdo Hahoodzo" [xòːztò xɑ̀xòːtsò] ; O'odham: "Alĭ ṣonak" [ˡaɺi ˡʂonak]) is a state in the southwestern region of the United States.  It is also part of the Western and the Mountain states.  It is the sixth largest and the 14th most populous of the 50 states.  Its capital and largest city is Phoenix.  Arizona is one of the Four Corners states.  It has borders with New Mexico, Utah, Nevada, California, and Mexico, and one point in common with the southwestern corner of Colorado.  Arizona's border with Mexico is 389 miles (626 km) long, on the northern border of the Mexican states of Sonora and Baja California. The 1955 Great Plains tornado outbreak was a deadly tornado outbreak that struck the southern and central U.S Great Plains States on May 25–26, 1955.  It produced at least 46 tornadoes across seven states including two F5 tornadoes in Blackwell, Oklahoma, and Udall, Kansas that caused most of the casualties.  The outbreak killed 102 from three tornadoes while injuring hundreds more.  Unusual electromagnetic activity was observed, including St. Elmo's fire. The Northern short grasslands is one of 867 terrestrial ecoregions defined by the World Wide Fund for Nature.  This ecoregion includes parts of the Canadian provinces of Alberta and Saskatchewan, and the American Great Plains states of Montana, North Dakota, Wyoming, South Dakota and Nebraska.  The United States Environmental Protection Agency (EPA) further breaks this ecoregion into the Northwestern Glaciated Plains and Northwestern Great Plains. The The Northern Great Plains History Conference (NGPHC) is an annual conference of history professors, graduate students, historical society experts and other scholars based in the Great Plains states of the American Midwest.  The Conference features scholarly papers by academics and advanced students on a variety of topics, especially in social history and military history, as well as regional topics regarding the Great Plains. The Mountain States (also known as the Mountain West and the Interior West) form one of the nine geographic divisions of the United States that are officially recognized by the United States Census Bureau.  It is a subregion of the Western United States.  The Mountain States are usually split up into two other regions known as the Northwest and Southwest.  Idaho, Montana, and Wyoming are considered part of the Northwest, while Arizona, Colorado, Nevada, New Mexico, and Utah are considered part of the Southwest. The Great Plains Shelterbelt was a project to create windbreaks in the Great Plains states of the United States, that began in 1934.  President Franklin D. Roosevelt initiated the project in response to the severe dust storms of the Dust Bowl, which resulted in significant soil erosion and drought.  The United States Forest Service believed that planting trees on the perimeters of farms would reduce wind velocity and lessen evaporation of moisture from the soil.  By 1942, 220 million trees had been planted, stretching out 18600 mi in a 100-mile-wide zone from Canada to the Brazos River.  Even as of 2007 , "the federal response to the Dust Bowl, including the PSFP [Prairie States Forestry Program] which planted the Great Plains Shelterbelt and creation of the Soil Erosion Service, represents the largest and most-focused effort of the [U.S.] government to address an environmental problem". The tornado outbreak of June 16–18, 2014, was a tornado outbreak concentrated in the Great Plains and the Midwestern United States.  Two tornadoes also occurred in Ontario.  The severe weather event most significantly affected the state of Nebraska, where two twin EF4 tornadoes killed two and critically injured twenty others in and around the town of Pilger on the evening of June 16.  The two Pilger tornadoes were part of a violent tornado family that produced four consecutive EF4 tornadoes and was broadcast live on television.  The outbreak went on to produce multiple other strong tornadoes across the northern Great Plains states throughout the next two days.
Answer: Arizona