How would the Revolutionary War and War of 1812 change if Canada joined the United States?
Short answerBritain might fight harder for Canada's resources during the Revolution, while the War of 1812 would become chiefly naval because the United States would lack a Canadian land frontier to invade.
NotesAn American Canada would probably mean several additional states and a very different Revolutionary War. Canada supplied fisheries, Hudson's Bay Company resources, and strategic value that could make Britain fight longer rather than simply abandon the colony. In 1812, removing the Canadian frontier eliminates the United States' preferred land objective and turns the conflict much more decisively toward naval warfare. Any direct invasion of British territory would then require an Atlantic crossing with serious operational and political costs.