The answer to this is African Americans.
Back around World War II they mostly pay attention to the war so the whole racism left African Americans alone because around that time they didn't quite care for that too much because they mostly want to keep on the whole war thing. Around that time the U.S was just about getting ready to get involved.
Hope this helped :)
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Large areas of Europe were in ruin.....ww2
Germany militarism .....was caused by ww1, and the frustration of the war,due to defeat
rising tide of immigration...resulted from ww1
sustained economic growth ..resulted after ww2,a period after ww2, when western European countries and USA experienced unprecedented economic growth.