Canadians are allowed to stay for six months on a visa waiver out of the 12 months cycle. You need, seek a visa.
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There are really several answers to this question.
Mr. Segal is correct in that a person from Canada is 'waived' in for 6 months at a time.
But, the more important question is: What do you intend to do in the US during that 6 months?
As for 'telling' the Canadian government that you are leaving ... I'm not so sure you need to ... why are you concerned?
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Why is there a concern for telling the Canadian government? And why do you think a Canadian have trouble crossing into Canada?
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