Black Americans Black Americans are those persons in the United States who trace their ancestry to members of the Negroid race in Africa. They have at various times in United States history been referred to as African, coloured, Negro, Afro-American, and African-American, as well as black. The black population of the United States has grown from three-quarters of a million in 1790 to nearly 30 million in 1990. As a percentage of the total population, blacks declined from 19.3 in 1790 to 9.7 in 1930. A modest percentage increase has occurred since that time. Over the past 300 and more years in the United States, considerable racial mixture ha