"A Long, Four-Decade Pause"

"It's not the first time politicians have latched on to economic unrest and public safety concerns to press a hard-line, anti-immigration agenda. In 1921, Congress passed, and President Warren G. Harding signed, the 'Emergency Quota Act,' sharply reducing the number of immigrants permitted to enter the country. A putative response to rising unemployment and social unrest, in reality the law represented the culmination of decades of racial and religious-motivated bigotry against newcomers from southern and Eastern Europe and Asia. It also portended a long, four-decade pause in the country's openness to immigration."

Joshua Zeitz at Politico compares Donald Trump to Warren Harding.