What's with the friendly rivalry between America and Canada?

Me

Active member
Mar 15, 2008
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For example in TV shows and sitcoms like How I Met Your Mother, America seems to 'hate' Canada and vise versa. I keep hearing phrases like "Be careful Canada might invade.. etc etc", but I don't get the history that makes it funny.
I tried looking it up but nothing seems to answer my question :] Also I'm not from any of those countries so I don't have a clue 8)
 
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