Answer:
They were fed up with being racially discriminated against so , they began migrating up north . Which led to Black neighborhoods forming into cities all over the North, including New York City. Harlem, a neighborhood originally built for a white,upper-middle class population, was one of these. In 1910, a group of African American realtors purchased several blocks in the area and opened the neighborhood to Black migrants from the South. Not only did African Americans settle there but Caribbean immigrants seeking a better life did, as well. These immigrants, some of whom were former slaves, also faced discrimination and oppression in their home countries. That's how it changed.
