Historians including David McCullough, Ken Burns, Robert Caro, Ron Chernow and Vicki Lynn Ruiz have all posted short videos explaining why Trump’s campaign is disturbing to a Facebook page called “Historians on Donald Trump.” … Ruiz, a professor of history at The University of California, Irvine, put Trump’s hateful rhetoric toward immigrants in the context of anti-immigrant attitudes of the 20th century. She explained how the Ku Klux Klan targeted Catholics − who were seen as “foreign agents” − in the 1920s and how Congress passed the Johnson-Reed Act, which imposed immigration quotas, in 1924.

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