President Donald Trump did not just announce a major foreign-policy move tied to Venezuela. He reached back 200 years for the argument, and then gave it a nickname that instantly set off alarms and applause in equal measure.

In the wake of U.S. military action that the administration says led to the arrest of Venezuelan leader Nicolás Maduro, Trump pointed to the Monroe Doctrine, the 1823 warning to Europe to stay out of the Western Hemisphere. The result is a collision of slogans and stakes: America First politics on one side, and a doctrine historically used to justify intervention on the other.

Why Trump reached for a 19th-century doctrine in a 21st-century operation

Trump framed the operation and Maduro’s arrest as part of a hemispheric security campaign, leaning on the Monroe Doctrine’s basic idea that outside powers should not gain a foothold in the Americas. In remarks described by the Associated Press and published by PBS News, he even quipped that some people now call it the Don-roe Doctrine.

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