I think that the US relationship to race and immigration is the unholy synthesis of chattel slavery (via the British-dominated triangle trade) and La Conquista peonage, which is the outgrowth of Euro colonial adventures in (North) Africa
And when Europeans say "we're not racist like Americans" they usually are focused on *one* of those two but are willfully blind to the other
French liberals overlook their history in Algiers; Belgians overlook Congo; Italians Ethiopia