This is why the 25th amendment exists. A paranoid dementia patient thinks Canada is a “vulnerability” We’ve had joint defense infrastructure with Canada since the 1950’s. Including missile defense, radar and joint troop deployments. The US cannot become safer by making Canada part of the US, because from a military perspective we already treat it that way. If Russian or Chinese planes or boats entered Canadian territory, we’d know about it and have full rights to respond to it, and likely would arrive at it *before* Canada, due to the coverage of Alaska. (Oh and PS - Canada pays a disproportionate cost for this infrastructure, so it’s actually cheaper for the US this way. We get the access, intel and security, for less cost)