A primer on the messy U.S. migration debate now spreading everywhere from Ukraine to Canada

At an outdoor processing centre for migrants at Eagle Pass, Tex., federal and state officers carry a migrant with a medical emergency out of a crowd.

The United States is experiencing a historic migration surge, and the political fallout is spreading to some far-flung and unpredictable places. Here are eight things to know that help explain the ongoing situation.

CBC | World News

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