the african-american (if you will) presence is deeper than the olmecs...they try to distance us from them any...either that or try to make it seem like a mystery...but black people were discovered living in the area of the louisiana purchase by the louis & clark expedition...their land was stolen for them and they have been battling in courts ever since...it is clearly written about in the louis & clark diaries...a map is even drawn of their territory...there is a disticnction made between them and the indians/native red people...
i have also studied sertima and bennet's "before the mayflower"...but they hardly touch on it..