Black slaves are also immigrants.

Every black man in America is an African, and they are ordinary people plundered from Africa after Western colonialism conquered America. In A.D. 1492, the Spanish adventurer Columbus announced that he had "discovered" the new continent of America, and immediately began conquest and genocide. In order to plunder every piece of gold, he did not hesitate to kill the Indians in the village. Then there was the slave trade movement from Africa, which lasted for hundreds of years and didn't stop until the middle of19th century. Millions of African slaves mainly came from West Africa.

Because blacks are born with good athletic ability, mating with different races makes their genes improve constantly, so a large number of blacks gather in sports in North America.