This question is very dependent on if we’re talking Canada always having been part of the US or today’s Canada joining in the US.
The former would be interesting, but the latter would be answered simply with “everything Safe D”
Alberta: *visible confusion*
Alberta would probably be Safe D too tbh. Even Albertan conservative (voters at least) are very different from American conservatives.
Their brand of conservatism seems similar to Montana or Wyoming - more libertarian than Bible-thumping. If Alberta was a state it would be Safe R at the presidential level, but I could see it electing Tester/Bullock/Heitkamp-type Democrats as governors and senators. At the same time, the oil industry there would make it trend R like North Dakota because of all the young conservatives moving in.