From a Reuters story

POTSDAM, Germany — Germany's attempt to create a multicultural society has "utterly failed," Chancellor Angela Merkel said on Saturday, adding fuel to a debate over immigration and Islam polarizing her conservative camp.

Speaking to a meeting of young members of her Christian Democrats (CDU), Merkel said allowing people of different cultural backgrounds to live side by side without integrating had not worked in a country that is home to some four million Muslims.

I would like to remind Chancellor Merkel that German Jews spoke fluent German, served in the German army during WW I and were proud to be Germans. When Hitler rose to power, none of that mattered.