Canadians call Wayne Gretzky a 'traitor' after tense 4 Nations hockey final / Canada has always had great hockey players -- but is it losing its edge? / Trudeau after Canada hockey win over US: 'You can't take our country -- and you can't take our game' / Why USA vs. Canada matters, and how the rivalry has already triggered a rich new era in international hockey / USA, Canada hockey stars who fought each other throw subtle jabs ahead of 4 Nations final / Canada, U.S. set to start next chapter of iconic hockey rivalry / US-Canada hockey game marked by booing at national anthem and 3 fights in 9 seconds / US, Canadian hockey stars get into numerous fights in opening seconds of 4 Nations rivalry after anthem boos / From Sid to Canada-U.S. rivalry: What to know about NHL's 4 Nations Face-Off / ANALYSIS: Annual hockey event all about being Canadian