Which group was more isolated from rest of the world before the 1400s:Africans or Native Americas and why?

It would be Africans because when they came in, they weren't appreciated and treated cruelly to the idea of racism which one race is believed to be superior then the other, they had a struggling time fitting in without being ridiculed by non colored people. It took them a long time to get the right to vote, so in my opinion I conclude that Africans didn't really have it easy ... because Native Americans were being pushed from their land, forcing to sign treaty after treaty.