If all of modern america went back to where the majority of their race came from?

Also black people where in America long time ago before Slavery even began. They came to America around 3,000 B.C. travelling and they went to other parts like Jamaica, Haiti, Cuba, etc. then around 1500 they were captured by Europeans and forced as slaves but this time brought to America by capture. It wasn't just innocent travelling the second time. Also, around the time that slaves were brought to America. The Dutch came to South Africa and took over that's why you have a lot of white people in South Africa.