could Canada and the US invade each other again?
Since imagining the precise repeating of history is now popular, let's consider that one:
During the War of 1812, Madison's strategy was to invade Canada, grab some British territory and have something to bargain with for a treaty. It went very poorly due to a lot of incompetence, and in the process British and Canadian forces counter-invaded the US, even a force headed by the governor of NS captured much of Maine.
Since the US is now vastly more powerful, will it invade Canada?