What demographic shift caused the African American population of Harlem to grow rapidly in the early-1920s? the move to the Sun Belt the move to the Rust Belt Suburban Sprawl Great Migration

The answer is: The Great Migration.

Explanation:

The Great Migration is name for a demographic shift that involved the relocation of more than 6 million African Americans from the rural south to north and west regions of the country, including Harlem and other neighborhoods in several northern cities.

This migration was driven by different factors, mainly the harsh segregation policies across the south and the lack of economic opportunities; which led African Americans to look for jobs in the industrial northern areas and to seek for a place for themselves in public life.

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the constitution of the united states gave congress the absolute authority over immigration laws