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the 51st state thing is tabloid level headline nonsense
there is no way it would happen peacefully. , it would only happen after a military invasion or a coup backed by the US. Abandon any idea of Canada becoming a state, it would be occupied territory without legal representation and likely very few if any rights. and it would remain that way for at least a generation or two before any small “new states” were carved out, and collaborators would be allowed to rule over small regions for the interest of keeping the peace. after a healthy amount of colonization of American loyalists, murder of Canadians and imprisonment of dissidents. but all in all. make no mistake, it would be a shooting war, and it would certainly cause civil war in america too, as this is a red line.
you need only look to Eastern Ukraine to see how this sort of thing plays out.
Armed coercion, military invasion, fake referendums, importing migrants to replace the dead and evicted with "colonists’. suppression , imprisonment and murder of locals who dont swear fealty. etc.
Russia took the final step into fascism in 2022.
But its useful to understand that Nazi in Russia, just means someone who opposes Russia, (and Russians can’t see their country as anything other than an imperialist warmonger, spheres of influence and fighting in massive wars is a cornerstone of what Russians think is their national identity thanks to decades of propaganda and abuse)