outlaw religion. it's the cause of every damn war except the civil war, that was about state's rights. and the spanish american war had something to do with cuban independence, which didn't happen, did it communism? world war 1 wasn't related to religion and world war 2 was caused directly by world war 1, so that's out of the question (but hitler did kill a lot of jews, but that's not a war, that a genocide)
ok, maybe religion didn't cause that many wars, but it has cause billions fold of people to do dumb shit.
which brings me to my first decree as emperor: kill westboro baptist church