My "United States of the Americas and Oceania" TL shows a complete American victory in the War of 1812, although it is wholly different from OTL. First, the British enact an oppressive Quebec Act, so Quebec and Nova Scotia fully join the American Revolution and the USA afterwards (alogsdie wtih Bahamas and Bermuda). Second, Washington is butterflied into getting a third term, so no Alien and Sediction Acts, and the Federalists enjoy a 40-year political dominance, which they put to good use to boost US internal development and military preparedness substantially. As a result, America wins a complete victory in the French-American War (OTL Quasi-War), which vindicates federalist policies, and comes to 1812 fully prepared with a kickass Army, Navy, and Militia. US forces soon kick the British out of Rupert's Land, give the RN a worthy fight alongside American coasts and in the Caribbean, allowing the Americans to land and conquer Jamaica, Hispaniola, and Guyana (although landings in Cuba and Trinidad are repelled by the RN). Last but not least, the Congress of Vienna collapses, Britain, France, and Austria come to blows with Prussia, Russia, and Naples over the Poland-Saxony plan, and Napoleon makes his comeback in the middle of that war, turning it into a merry three-way fight. As a result, Napoleon curbstomps Wellington at Waterloo, and Prussia-Russia crush Austria. Faced with mounting defeats, the Tory war government collapses, and the new Whig government pleads for peace. America gets Rupert's Land, North-Western Territory, Labrador, Jamaica, and British-Dutch Guiana at the peace table.