I havent read the entire thread yet and can only imagine the racist cluster**** it is.
However I think that just like any other people from other countries looking for a better life, they would have come here. And been subjected to the same prejudices and barriers that Italians, Irish, Poles, Chinese, etc. suffered until they also were assimilated into our culture. Would their skin color have been a bigger hurdle to overcome? Probably unfortunately.
If my presumption of cluster**** is wrong, I apologize in advance.