I think that Canada and the East Coast would become independent by the mid-1800s as one country. North America would become far more diverse in this timeline with French speakers in Louisiana all the way up to the border with Canada, a Spanish speaking west coast and depending wherever Russia bothers to keep Alaska, a Russian speaking orthodox Alaska. This union between Canada and the East Coast would not become a world superpower with that role staying with the UK until WWII (assuming that the butterfly effect does not prevent the war from happening) Where the Soviet Union overtakes the UK as its empire crumbles due to lack of funds caused by the war.