Do i obligation a visa to enter canada?

i am going to canada in 3 days and im comming back on saturday do i need 1?
Answers:   
Where do you live? What is your citizenship?
If you are entering thru the United States as a visitor, later you don't need a visa. Just ID identifying your citizenship.
How can anyone relay you? We don't even know where you are from?
If you re from Canada, I would assume you don't need one to enter your own country.
umm that would depend on where your from


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