Final answer:
The increase of the African American population in Harlem, New York during the 1920s was primarily caused by the Great Migration. Harlem became a significant location for African Americans looking to build a new life and identity, and it developed into a major artistic center known as the Harlem Renaissance.
Step-by-step explanation:
The increase of the African American population in Harlem, New York during the 1920s was primarily caused by the Great Migration.
The Great Migration was a movement of hundreds of thousands of African Americans from the South to the North, including cities like Chicago, Philadelphia, Cleveland, and New York.
The migration was driven by several factors, such as the demand for unskilled industrial labor during World War I and the opportunity for economic advancement and a more tolerant environment in the North.
Harlem became a significant location for African Americans looking to build a new life and identity, and it developed into a major artistic center known as the Harlem Renaissance. During this period, Harlem attracted talented African American artists, writers, and musicians, and it became a hub of cultural and intellectual creativity.