Canadians, take a shovel and start digging trenches along the entire border. 3 trenches deep, with extra circular ones around cities and logistic hubs. […] All of this can be done without conscription

I think you may be somewhat unfamiliar with just how vast that border is. It’s the longest international border in the world, 8,891 kilometers (5,525 miles) long.

If the Americans really do invade we’ll be defending via means other than World War I era trenchworks.