The US militia that everyone talks about in relation to the 2nd amendment weren't meant to protect the US from Canada. It was in response to a feared slave uprising from within.
As flawed as the founding fathers were, they were probably smart enough to understand that the nature of the threats the country would face were likely to evolve over time.
There were other powers on North America.
But no, instead we should pretend it had something to do with shooting a president you don't like. Because that's what "freedom from tyranny" is.
Do you think this makes you look smart?