Why are blacks in America not as black as blacks in Africa?

It is caused by intermarriage. Because according to the latest evolutionary theory, the change of biological genome is sudden, not gradual. The time of gene mutation must be longer than the hundreds of years that black people have lived in the United States. So neither latitude nor light is the decisive factor of black physical characteristics. Most black Americans have paternal Europa descent, which is the product of slavery. According to the data of American gene bank, 2/3 blacks are mixed-race, accounting for 16% of Europa genome on average. As a result, some black Americans have whiter skin and more body hair. In addition, unlike Obama, blacks and whites in the United States are more likely to become whites because blacks have white genes.

Black Americans immigrated from Africa in the past, and the way of immigration was the slave trade in modern history. So African-Americans and African-Americans belong to the same race by blood. However, the land in Africa is barren. Most African blacks are thinner because of malnutrition, and their heads and stomachs are bigger. The living conditions of African blacks in the United States are relatively good.

Due to the increasing intermarriage between whites and blacks of the yellow race (Asians and local Indians) in modern America, black Americans are also influenced by other ethnic groups to some extent.

Black Americans have played an important role in history. They actively participated in the American War of Independence and the Anti-Fascist War and made many achievements. They have also made great contributions to the economic and cultural development of America. They have always been the main force of American agriculture.

The wheel of history will not go backwards. Let bygones be bygones. The earth is a big family, and skin color doesn't mean anything.