The ONLY way Canada would ever even entertain considering joining the US is if they give up their guns and implement a training and licensing regime based on gun ownership being a privilege, not a right. They would have to implement universal health care and get rid of the parasite class of unnecessary profit sucking health insurance companies. They would have to agree that every citizen has the absolute right to vote, electoral boundaries must be set by a non-partisan commission, that every citizen has free and equal access to the ballot box, and elections are carried out by marking an X on a piece of paper using a stubby pencil, putting that piece of paper in a cardboard box, opening that cardboard box at the end of the night, counting the ballots, calling in the count, and declaring a winner by midnight on election day. That religious freedom means that you can practice your religion however you want right up until it has any effect on anyone other than you and then it stops and that religious freedom is NOT the right to discriminate. That everyone is equal, has the right to love and marry whoever they want. That workers have rights, get vacation, sick leave, parental leave, bereavement leave, and that those things are entitlements. That free speech doesn’t include hate speech, racism, discrimination, harassment, or doxing.

That’s just a start. If you can’t agree to those conditions then it’s a non-starter.