re: Is there any historical evidence of diversity working out?

quote:

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Up until the hart-celller inmmigration act in 1965, The United States was not very diverse, it was close to 90% white, and it was doing pretty well.

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And 90%+ Christian but they were comprised of people from English Isles, France, Netherlands, Belgium, Germany, Italy, and Poland. The Italians and Polish didn't arrived until the 1870s-1930s as well. They were different from each other but still had some core similarities. Meanwhile today's immigrants from the Middle East and Africa are different in almost every way.