Blacks did not come to white countries at the first place.It is whites who invaded the africa ,enslaved them,then destroyed their livings and made them to return to white countries.Even USA is not belonged to whites.It is a robbed land by genocide and invasion.Whenyou talk about migration, we have to consider these facts as well.People who live in a robbed country should not talk about nationalism.Everything is artifical.Divisions were created by the society and mythologcal religions.