Why was the history of slavery repressed for so long ?

Slavery lasted in about half of U.S. states until 1865. As an economic system, slavery was largely replaced by sharecropping and convict leasing. By the time of the American Revolution (1775–1783), the status of enslaved people had been institutionalized as a racial caste associated with African ancestry.

we will reach the goal of freedom in birmingham and all over the nation,

d. hip hop

it was originated in the 70s while the harlem renaissance occured in the 1920s