Canadians would all be under intense surveillance and I'm pretty sure the USA would not allow us to travel freely. That's how they'd try to stifle guerrilla resistance: they'd pin us down in our towns and cities and watch our every move. Since Canada is still addicted to US tech, in our homes and work and government, such surveillance would be easy and pervasive. And if, like me, you have criticized the USA online for years, you can expect them to know and come for you, and they'll have the camps ready. We would not be living freely under US rule. The idea that we could sit tight and wait for chances to fight back is optimistic.