Hi, there was a similar question the other day:
The top answer is links to other previous questions and answers which cover what you want to know
Hi there -- some of these older answers may be of interest to you, in particular the top one from u/400-rabbits:
https://www.reddit.com/r/AskHistorians/comments/2ymmws/africans_in_the_americas_prior_to_europeans/
https://www.reddit.com/r/AskHistorians/comments/1zmi5t/is_there_any_evidence_that_moors_reached_the/