agreed, actually at this time, upper and lower Canada were one province, so we might see a large canada state, just with land ceded to unorganized Territory. If we assume 65 [perhaps Britain joins the Civil War on the CSA side and still lose, doesn't really matter how], then the northern US territories are actually more likely to see added territory. Namely Montana and Washington
My guess is that we'll see Vancouver Island and maybe the Queen Charlotte Islands added to Washington, BC admitted as a state [EIther as Columbia, Fraser or New Caledonia], land added to Montana, No manitoba, A Canada State consisting of OTL Lower Canada and the Niagra peninsula of Upper Canada, add 6 territories cut out of Canada [The Southern Prairies, Upper Prairies, Keewain, North of Great Lakes, Unguva and OTL Canadian Territories], When Alaska is purchased, it will likely be added onto Yukon. We also will likely see the southmost of these territories eventually be divided into multiple territories before statehood. Each of the maritimes provinces will likely be states