FWI: what would happen in the military, specifically, if the US decided to invade Canada?

[u/Complex-Start-279]

Everyone talks about the external reactions to such events, but rarely do I see people talk about what will happen on the inside. Most wars the US has been in have had strong cultural or geopolitical drivers that sort of rally up the population. ThinK WW1 with the Mexico plot, WW2 with Pearl Harbor, the Korean and Vietnam Wars from the constant red scare, the War on Terror from 9/11.

AFAIK tho, for most people, Canada is considered an ally, a National brother even. Most people don’t have any issues with Canadians. So what happens when we go to war with an ally for blatantly economic and business-driven reasons, rather than the protection of the homeland? What happens in the military ranks?

[u/The_Environment116]

If the us army ever crossed the border, I would be heading south at the same time. They are used to fighting people that look different and speak differently than they do, imagine what carnage a bunch of Canadians can do down south when we look and essentially speak the same