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The second Ku Klux Klan, which flourished in the U.S. in the 1920s, used strong nativist, anti-Catholic, and anti-semitic rhetoric, but the Catholics led a counterattack, such as in Chicago in 1921 where ethnic Irish residents hanged a Klan member in front of 3,000 people.
Passage of laws restricting immigration. A belief that one's native land needs to be protected against immigrants.