I don't think that's accurate. Europe is almost entirely European, Asia is almost entirely Asian, Africa is almost entirely African. Even Wisconsin at 86.5% white is less white than most European countries. And Milwaukee itself is 40% black and 17.3% Latino.

The countries that come anywhere close to the US on diversity are predominantly the other countries in the Americas.

Segregation is probably a more chronic problem there than it is or was ever here.

  But Saint-Denis is not a rich neighborhood.

  It's what the French call a "banlieue."

  Literally translated, the word means "suburb," but 
  it has come to be associated with the depressed, mostly 
  immigrant neighborhoods on the outskirts of the city
  where unemployment is high and opportunity scarce.

  "If you look at the situation of people, you 
  understand the path they have taken to become a 
  terrorist or whatever you call it," Villain told 
  CBS News correspondent Vladmir Duthiers. "Exclusion 
  makes the terrorist, in my opinion."

  .
  .
  .

  The French government does not keep statistics 
  based on race or religion, but surveys have found 
  unemployment is as high as 30 percent in these immigrant 
  neighborhoods.[1]

https://www.cbsnews.com/news/paris-banlieues-seeds-of-terror...