(Thoughts between me and @Joshua Ben Ari..) For whatever reason, say America does worst in the War of 1812, leading to the British (Who never saw the Louisiana Purchase as legal.) to take Louisiana. Leading to either... 1: Louisiana is given back to Spain with New Orleans as an Anglo-Spanish condominium. 2: Everything of Louisiana from 42°N and above is attaching to British Canada while spinning the rest off as a pro-British state or a separate British colony run from New Orleans. Could this happen? And the result from any of this?