"American black d.o.s." is an archetypal class of persons subject to relentless discriminatory propaganda and policy affects by that have prevented real economic and financial integration with the dominant culture of the US.

wikiwtf maintains an article, European migrant crisis, that summarizes entry to some EU member states and some EU policy "reactions" to curtail additional entry. It's estimated that the cumulative total of foreign, disoriented persons seeking residence in the EU is 5,033,545 to date.

They are not all going back to where they came from. And in as much as their arrival has provoked violence, stirred romantic "nationalist" propaganda or racists sentiments, and disrupted political status quo, it has revealed inadequate accommodations for their numbers.

How will EU member-states prevent or avoid replicating the caste/class system of integration, typified by US custody of American black d.o.s.?

Diversity is the key to economic and political evolution.