This Is Luzia, the second oldest skeleton ever found in the Americas. She died in Brazil 10,500 years ago at the age of 20-24. A recently dated skeleton from an island off the coast of California is older, Spirit Cave Woman has been dated to 13,000 years ago.
If you're interested in Africans in America, do a search on the name, Clyde Winters (Afro-centric). Most of his stuff is 'off-the-wall' but, some is believeable.