It used to be called Dominion Day, commemorating Confederation in 1867.
Like the USA, Canada used to be a collection of little colonies, but after the US civil war, they decied to unite to form a country (more or less so they wouldn't be annexed by the US). Of course, they were mostly Brits, so instead of rebelling against Britain they just politely asked the queen for permission to be given their own parliament.
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