No stupid question… it seems Trump is ready to invade (military) Panama and Greenland (red white blueland), so even if with Canada he always talk about economic war and annexing Canada blablabla…
What would happen if USA invades Canada? What would be the reaction of the Canada King (Charles III is the king of Canada)? The Commonwealth? NATO?
A 500t nuke could take out the white house, capitol hill and not too much fallout beyond.