Firstly, he was turned into this by his American floozy of a wife whose californian degeneracy is spready throughout the western world.
Secondly, The War of 1812 was hardly a victory for America. A failed attempt to annex Canada that ended with the status quo ante bellum was a victory for Britain, not the US.
It was a draw for America. However, it was a strategic victory for us in that we showed the world we could stand toe to toe with the best army in the world.