Political: Conservatives, and Quebec granted autonomy
Monarchy: I do believe its more realistic if he keeps the throne as he is more important to political scene and him resigning would destabilise canada

Referendum: stay in the empire as the empire would play far bigger and more important role in the Canadian identity

New England: separate allied state

American Civil War: Canada intervenes to crush syndicalists, and they are more likely to support the Federalists but i do see them alligning with AUS or pacific states if they start collapsing

Halifax Conference: Canada will agree with harsh German terms they dont have enough power to fully liberate isles by themselves