As I understand the Anglo-American war of 1812 was envisaged by many Americans as the simple task of just marching since they believed the Canadian colonists as they had done in the 13 colonies would see the US as liberators and soon expel the British from the continent. Also it appears from other threads in the past the US did not have the military capacity to conquer British North America. However say there was great support for revolution in British North America could the USA have gained Canada from the war of 1812? If so how would the following two centuries be affected (i.e. Anglo-American relations, WWI, WWII, Cold War etc)?