Why are there black Americans and black Africans? Are they the same species?

Black Americans migrated from Africa, and the way of migration was the slave trade in modern history. Therefore, black Americans and African blacks belong to the same race in blood. The land in Africa is barren, and most African blacks are thin, with big heads and bellies and malnutrition. The living conditions of African blacks are relatively better than those of African blacks, which does not exist in African blacks.

In modern times, the frequency of intermarriage between whites and blacks of the yellow race (Asians and local Indians) in the United States has increased, so the blacks in the United States have also been influenced by the consanguinity of other nationalities to some extent.