What would the capital city of Canada be if the capital city of the US were the capital of Canada?

I guess Washington D.C.

Explanation:

wish I could help sorry have a great day

Washington, D.C.

Explanation:

The capital city of the United States is Washington D.C. so if the capital city of the U.S. was also the capital city of Canada, Canada's capital would be the U.S. capital of Washington D.C.

This might have been the case if the U.S. had managed to incorporate Canada into the United States during the American Revolution and the subsequent, War of 1812.