Canadians may be polite, but that doesn't mean Canada is a pushover. Canadians and Americans are friends, but Canadians don't want to be Americans.
The last time the USA tried to conquer Canada didn't end well. For them.
Even in the worst case scenario for us, we still win.
https://theconversation.com/why-annexing-canada-would-destroy-the-united-states-249561