I met one of the editors of the Danish
newspaper, Dagbladet Information, at coffee. We discussed the issue of
Muslim integration in Europe. A sore and significant subject.
It appears to me that the slow assimilation of non-Europeans all over Europe in comparison to the more rapid assimilation in the U.S. is a matter of hereditary social class.
Americans have never believed we had hereditary social classes and we actually haven't had them since 1960. That means Americans have been generally more willing to be flexible in employment hiring and promoting than Europeans who believe they have hereditary social classes to consider and actually do have them.
America not only has a more vital and open commercial society focused on merit compared to Europe's elitist academic, government oriented society but America also has a 200 year history of 'move on' if things don't suit you in one place. That experience inherently rewards merit and creates geographic clusters that are more convivial to assimilation.