Booing during "The Star-Spangled Banner¡± at sports games in Canada.
"Buy Canadian¡± signs multiplying at grocery stores amid a brewing boycott of U.S. goods.
Cross-party calls to find new friends and customers on the global stage.
Trucks cross the Ambassador Bridge between Detroit and Windsor, Ontario, in Canada in the early morning hours of Feb. 1.
| Brittany Greeson / The New York Times
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