Question: In 1970, a bridge built in 1890 was demolished in this place populated through the centuries by a series of ethnic groups new to the area, such as the Irish, Polish, and African Americans?

Context paragraphs:
Poles in Chicago: Poles in Chicago are made up of both immigrant Poles and Americans of Polish heritage living in Chicago, Illinois.  They are a part of worldwide Polonia, the proper term for the Polish Diaspora outside of Poland.  Poles in Chicago have contributed to the economic, social and cultural well-being of Chicago from its very beginning.  Poles have been a part of the history of Chicago since 1837, when Captain Joseph Napieralski, along with other veterans of the November Uprising first set foot there.  As of the 2000 U.S. census, Poles in Chicago are the largest European American ethnic group in the city, making up 7.3% of the total population.  However, according to the 2006–2008 American Community Survey, German Americans and Irish Americans each had slightly surpassed Polish Americans as the largest European American ethnic groups in Chicago .  German Americans made up 7.3% of the population, and numbered at 199,789; Irish Americans also made up 7.3% of the population, and numbered at 199,294.  Polish Americans now made up 6.7% of Chicago's population, and numbered at 182,064.  Polish is the third most widely spoken language in Chicago behind English and Spanish.

Ethnic groups in Omaha, Nebraska: Various ethnic groups in Omaha, Nebraska have lived in the city since its organization by Anglo-Americans in 1854.  Native Americans of various nations lived in the Omaha territory for centuries before European arrival, and some stayed in the area.  The city was founded by white Anglo-Saxon Protestants from neighboring Council Bluffs, Iowa.  However, since the first settlement, substantial immigration from all of Europe, migration by African Americans from the Deep South and various ethnic groups from the Eastern United States, and new waves of more recent immigrants from Mexico and Africa have added layers of complexity to the workforce, culture, religious and social fabric of the city.

Mufti Muhammad Sadiq: Dr. Mufti Muhammad Sadiq was a companion of Mirza Ghulam Ahmad and the first Muslim Missionary in America converted over seven hundred Americans to Islam directly and over thousand indirectly.  His purpose, as a representative of the Ahmadiyya Movement in Islam, was to convert Americans to Islam and clear general misconceptions about it.  Something that separated Mutfi Muhammad Sadiq from his contemporaries was the belief in Racial integration between all racial and ethnic groups not just African Americans.  A large number of Islamic oriented organizations that sprang up among African Americans in the 1920s and 30's such as the Nation of Islam were influenced by Mufti Muhammad Sadiq's teachings and turned toward his understanding of Islamic concepts.  He was also important in trying to unite a hodgepodge of Muslim immigrants from Arabs to Bosnians to build mosques and have congregational prayer especially in Detroit and Chicago.

Sheridan Hollow, Albany, New York: Sheridan Hollow is a neighborhood in Albany, New York located in a ravine north of Downtown Albany.  Capitol Hill to the south and Arbor Hill to the north flank the ravine.  Often the neighborhood is overlooked by city residents, and outsiders who work in the neighborhood often don't recognize the name of the neighborhood.  This is due to the identity of the Hollow being subsumed into its larger neighbor Arbor Hill, for instance news stories of events are often accredited to the wrong neighborhood.  Being on undesirable land for development in colonial times, growth was slow in the Hollow and the neighborhood was populated through the centuries by a series of ethnic groups new to Albany, such as the Irish, Polish, and African Americans.

List of riots and civil unrest in Omaha, Nebraska: The following is a list of riots and civil unrest in Omaha, Nebraska.  With its economic roots in cattle processing, meatpacking, railroads, manufacturing and jobbing, the history of Omaha has events typical of struggles in other cities over early 20th-century industrialization and labor problems.  Racial tension was deeply based in economic and social competition as older immigrants had to contend with different ethnic groups from eastern and southern Europe and African Americans from the South.  The latter were recruited for jobs in the expanding meatpacking plants as World War I shut off immigration from Europe.  While numerous African Americans migrated to the city in its growing industrial phase, they were a distinct minority within the overall state population.  Civil disorder in Omaha has related to the most critical events and tensions of an era, from showing support of homeless people in the 1890s; to anti-strikebreaker sentiment, focused on new Japanese residents at the turn of the 20th century; to anti-war events in the 1970s.  The 1960s inner-city riots that destroyed parts of the Near North Side neighborhood were another manifestation of social and economic tension breaking out in violence.

Hawk Street Viaduct: The Hawk Street Viaduct was a bridge spanning the Sheridan Hollow neighborhood in Albany, New York.  Built in 1890, it was demolished in 1970 after decades of neglect which caused it to be limited to pedestrian traffic only in 1968.  It was the first cantilever arch bridge in the world.

List of ethnic groups in Vietnam: Vietnam is a multiethnic country with over fifty distinct groups (54 are recognized by the Vietnamese government), each with its own language, lifestyle, and cultural heritage.  Many of the local ethnic groups residing in mountain areas are known collectively in the West as Montagnard or Degar.  The largest ethnic groups are: Kinh (Viet) 85.7%, Tay 1.9%, Tai Ethnic 1.8%, Mường 1.5%, Khmer Krom (Khơ Me Crộm) 1.5%, Hmong 1.2%, Nùng 1.1%, Hoa 1%, others 4.3% (2009 census).  The Vietnamese term for ethnic group is người thiểu số or dân tộc thiểu số (literally "minority people").  One distinctive feature of highland ethnic minority groups in Vietnam is that they are in colorful attires whether at home, in the farm, on travel or in the town.  Many of the ethnic groups elsewhere such as southern part of Vietnam, Cambodia, Laos, Myanmar, China, Papua New Guinea, and many other countries do not wear attractive clothes while engaged in their day-to-day activities.  The clothes of one group is quite different from that of other groups that adds color to the social landscape.

Racial classification of Indian Americans: The racial classification of Indian Americans has varied over the years and across institutions.  Originally, neither the courts nor the census bureau classified Indian Americans as a race because there were only negligible numbers of Indian immigrants in the United States.  Various court judgements instead deemed Indians to be "White" or "not White" for the purposes of law.  In 1970, in the most recent assignment, the U.S. Census Bureau designated Asian Indians as White.  Since 1980, while keeping the validity of its earlier designation (White), the U.S. Census Bureau further allowed Indian Americans to self-report their ethnicity, owing to the immense diversity of the Indian subcontinent, which is home to more than 2000 different ethnic groups and all the racial groups known to mankind.  Only the continent of Africa exceeds the linguistic, genetic and cultural diversity of the nation of India.  The decision to let Indian Americans self-identify was made both in light of the aforementioned diversity in India, which has all the different racial groups represented in its diverse population, in addition to accommodate the fact that in recent years, increasingly diverse racial and ethnic groups of Indians and South Asians have immigrated to the United States, including from the North-West of the Indian subcontinent, where Caucasian ethnic groups are found.

African Americans in Tennessee: African Americans are among the largest ethnic groups in the state of Tennessee, making up 17% of the state's population in 2010.  African Americans arrived in the region prior to statehood.  They lived both as slaves and as free citizens with restricted rights up to the Civil War.  The state, and particularly the major cities of Memphis and Nashville have played important roles in African-American culture and the Civil Rights Movement.

African-American teachers: African-American teachers educated African Americans and taught each other to read during slavery in the South.  Slaves ran small schools in secret, since teaching a slave to read was a crime (see Slavery in the United States#Slave codes).  While, in the North, African Americans worked alongside with Whites.  Many privileged African Americans in the North wanted their children taught with White children, and were pro-integration.  The Black middle class preferred segregation.  During the post-Reconstruction era African Americans built their own schools so they didn't have White control.  The Black middle class believed that it could provide quality education for their community.  This resulted in the foundation of teaching as a profession for Blacks.  Some Black families had multiple individuals who dedicated their lives to teaching.  They felt that they could empower their communities.  In the late 19th and early 20th centuries, Southern States passed Jim Crow laws to mandate racial segregation in all aspects of society, and prevent Blacks from voting.  Racism made it difficult for Black professionals to work in other professions.  In 1950, African American teachers made up about half of African-American professionals.

Supporting paragraphs: Hawk Street Viaduct Sheridan Hollow, Albany, New York
Answer: Sheridan Hollow