It has everything to do with what people ticked on the form. It says nothing about African Americans are only those with origins in Subsaharan Africa. Your link was a spreadsheet! The real definition is at this link. Look where it says "A person whose origins in any of the black racial groups of Africa". This is from the US CENSUS. Please read it. Although I did make a mistake and used a wrong link before, but I changed it to the one I post here.  Talk