Ah, friend, America was importing people from Africa. Indeed “import” is rather more apt in this case than the several other you’ve ignored (e.g. the mass immigration from Vietnam at the finish of that war).

What a horridly dull country it would be were your understanding nearer the truth; what a betrayal of its dream to wish it as you see it; how silly you would seem to your know-nothing antecedents so lumping “Europeans” as one (it is an irony that in their comparatively more nuanced racialism they at least understood a little more of that continent’s ethnic and cultural diversity).