BOSTON — When the Canadian national anthem played for the second time Thursday night, there were no American fans left in the arena to boo.
Instead, the Canadian team stood at the blue line, arm in arm, player and coach and staff wearing their championship hats, while the maple leaf flag was lowered behind the 4 Nations Face-Off trophy. The fans who remained, many of them in their red Team Canada jerseys, sang along.
Connor McDavid scored at 8:18 of overtime to give Canada a 3-2 victory over the United States on Thursday night as the North American rivals turned what had been a tuneup for the 2026 Olympics into a geopolitical brawl over anthems and annexation as much as international hockey…