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OK... This is NOT going to go in much detail, sorry to let you down, its more like the "TL-in-a-day", only longer in time and span.
It however, will be very interesting.
The PoD is deliberately obscure, just to remind you of that. America is a parliamentary monarchy, and a dominion of Britain. Canada's split off due to strong anti-Catholic feelings and Britain wanting to weaken the potential dominion.
If I feel like it, or a lot of you demand, I'll go in other stuff, like culture and all that.