The United States is a multi-racial country, with four major races, namely, white, black, colored and Asian, accounting for 75%, 13%, 7% and 5% of the total population respectively.

Black Americans include:

1. Descendants of African slaves brought to the United States by European colonists in history.

2. Black immigrants and their descendants. It accounts for about 13.2% of the total population of the United States, and one third of them are mulatto (such as Obama), and English is widely used.

3. The racial classification of blacks mainly includes nilot, Bantu (both of which account for the vast majority of African black population) and Hermite. Mainly distributed in Africa, North America, South America and Europe.

Although Australian aborigines have dark skin color, they are demographically classified as brown people. The native place of black people is sub-Saharan Africa. Black people in America and Europe are mainly descendants of slaves in colonial period and black immigrants after World War II.