huehuehue social and domestic issue "more important to me" and education "somewhat important"... MURIKA!
The american melting pot was not a kind and "tolerant" process by any modern understanding. Even today I believe the uncompromising american national pride is partly the reasons why immigrants integrate much faster. It's certainly not anything to do with racial tolerance being somehow more common in the US, that's for sure.
Did you went to USA? Apart from NY, the immigrants are far for being integrated compared to EU. You can see everywhere, most of the people are interacting only with people from the same ethnicity and most of them are not even immigrants, they are 3-4th generations already. (not speaking about europeans descendants)
It seems you live in a different France than I, but in the street of France, most of the time you see people interacting with other from different ethnicity.