I think that right now the mood of the people around the world is already hair-trigger. Look at how quickly that convoy to Ottawa picked up steam not just in Canada, but around the world.

Here is my take on the situation: Should the events in the US become a kinetic civil war, which appears to be the path they are on right now, it would likely set off the rest of the world at the same time. Some of these countries are already involved in internal conflict against their governments but there's not much happening outside the borders of those nations. But if the US goes to war against itself I predict it will set off a chain reaction everywhere with countries full on fighting their governments as the people will decide it's 'now or never'.

I'd also think that governments themselves wouldn't be doing themselves any favors as they'd see what's happening in the US and jump the gun by going after their own people to preemptively stop it from happening in their country. Of course that leading to a civil war anyway. Trudeau has already demonstrated he's seize bank accounts unlawfully already so I have no qualms he'd mobilise the military.

Long rant short: You wouldn't get to fight a US civil war, you'd more than likely be dragged into a Canadian version of it instead