Why is Thanksgiving Celebrated on a different date in Canada?

Canada celebrates Thanksgiving on the second Monday in October. But, why do they do that? Why doesnt Canada celebrate Thanksgiving the same day as the United States? Basically, Thanksgiving is a day to give thanks and is not based on a historical date like Christmas.

What is Canadian Thanksgiving (or L'Action de grâce) and what

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The odd, complicated history of Canadian Thanksgiving

Canadian Thanksgiving: What is the national holiday and how is it

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Does Canada celebrate thanksgiving? When and why do they do it

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