Credit: Jeffrey Coolidge

On Friday evening, President Trump issued an executive order barring refugees from entering the country for 120 days — and Syrian refugees indefinitely. It also bans people from seven Muslim-majority countries from entering the country. The justification, allegedly, is security: The order is titled “Protecting the Nation From Terrorist Attacks by Foreign Nationals.”

But there’s precious little evidence that immigrants and refugees actually pose a serious terrorist risk to the United States. A recent report, from Cato Institute analyst Alex Nowrasteh, is one of the most sophisticated attempts to investigate this question. What it found was striking: The risk of terrorism from immigrants is astonishingly tiny.

Cato is a libertarian think tank that has a noticeably pro-migration stance. But Nowrasteh’s research is on really solid ground: He combed through data on terrorism and immigration from nine different sources, covering 1975 through 2015. He counted any attack on US soil in which an immigrant participated as a terrorist attack by immigrants, even if some native-born Americans also helped in its […]

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