Question: Which borough is the Boulevard named after the first African-American to Congress in?

Context paragraphs:
Rachel E. Pruden-Herndon: Rachel E. Pruden-Herndon (1898–1979) became the first African-American woman attorney to be admitted to the Georgia Bar on December 27, 1942.  She became the first African-American woman to be a City Court Judge in 1965.  She was also the first African-American woman from Georgia admitted to practice before the Supreme Court.

Mary Scales: Mary Caruthers Scales (September 24, 1928 - October 6, 2013) was a professor, civic leader, and funeral home owner.  She was the first black faculty member at Middle Tennessee State University where she taught in the College of Education, and became associate dean there.  Prior to this she had been a school teacher at Bradley and Bellwood schools.  She was later elected to the Murfreesboro City School Board, and to the Murfreeboro City Council as the first African-American female councilperson.  Scales Elementary School in Murfreesboro, Tennessee is named in honor of her and her husband, Robert W. Scales.  Her husband, Robert W. Scales was the first African-American elected to the Murfreesboro City Council and first African-American Vice-Mayor of the city.

John Wesley Gilbert: John Wesley Gilbert (July 6, 1864 – November 19, 1923) was the first African-American archaeologist, the first graduate of Paine College, the first African-American professor of that school, and the first African-American to receive a master's degree from Brown University.

Adam Clayton Powell Jr. State Office Building: The Adam Clayton Powell Jr.  State Office Building, originally the Harlem State Office Building, is a nineteen-story, high-rise office building located at 163 West 125th Street at the corner of Adam Clayton Powell Jr.  Boulevard in the Harlem neighborhood of Manhattan, New York City.  It is named after Adam Clayton Powell Jr, the first African-American elected to Congress from New York.  It was designed by the African-American architecture firm of Ifill Johnson Hanchard in the shape of an African mask in the Brutalist Architecture style.  It is the tallest building in Harlem, overtaking the nearby Hotel Theresa.

City Hall Station (Seoul): City Hall Station is a station on Seoul Subway lines 1 (Blue Line) and 2 (Green Line).  As its name suggests, Seoul City Hall is located right next to the station.  Deoksugung, a historic palace of the Joseon dynasty, is on the other side of the boulevard named Taepyeongno.

Adam Clayton Powell Jr.: Adam Clayton Powell Jr. (November 29, 1908 – April 4, 1972) was a Baptist pastor and an American politician, who represented Harlem, New York City, in the United States House of Representatives (1945–71).  He was the first person of African-American descent to be elected from New York to Congress.  Oscar Stanton De Priest of Illinois was the first black person to be elected to Congress in the 20th century; Powell was the fourth.

Willa Brown: Willa Beatrice Brown (January 22, 1906 – July 18, 1992) was an American aviator, lobbyist, teacher, and civil rights activist.  She was the first African-American woman to earn her pilot's license in the United States, the first African-American woman to run for the United States Congress, the first African-American officer in the US Civil Air Patrol, and the first woman in the United States to have both a pilot's license and a mechanic's license.  A lifelong advocate for gender and racial equality in flight and in the military, Brown not only lobbied the U.S. government to integrate the U.S. Army Air Corp and include African Americans in the Civilian Pilot Training Program (CPTP), but also co-founded the Cornelius Coffey School of Aeronautics with Cornelius Coffey, which was the first private flight training academy in the United States owned and operated by African Americans.  She trained hundreds of pilots, several of whom would go on to become Tuskegee Airmen.

Merze Tate: Vernie Merze Tate (February 6, 1905 – June 27, 1996) was a professor, scholar and expert on United States diplomacy.  She was the first African-American graduate of Western Michigan Teachers College, first African-American woman to attend the University of Oxford, first African-American woman to earn a Ph.D. in government and international relations from Harvard University (then Radcliffe College), as well as one of the first two female members to join the Department of History at Howard University.

Seventh Avenue (Manhattan): Seventh Avenue – known as Adam Clayton Powell Jr. Boulevard north of Central Park – is a thoroughfare on the West Side of the borough of Manhattan in New York City.  It is southbound below Central Park and a two-way street north of the park.

Lloyd Sealy: Lloyd George Sealy (January 4, 1917 – January 4, 1985) was the NYPD's first African-American officer to graduate from the FBI National Academy and the first African-American officer in the NYPD to make rank as the commander of a police station in 1963 serving the 28th precinct in Harlem.  He was also the first African-American officer to serve as Assistant Chief Inspector and Borough Commander serving the Patrol Borough of Brooklyn North (which included historical African-American communities such as Bedford-Stuyvesant, Brownsville, Weeksville, Clinton Hill, Fort Greene, and East New York, among others) in 1966.

Supporting paragraphs: Seventh Avenue (Manhattan) Adam Clayton Powell Jr.
Answer: Manhattan