War
War. What is it good for?
Taking Over Other People's Territory
If someone has a lot of nice land and you want it, war is generally the best option for obtaining it.
Polygamy
Do you live in a polygamist society and have a lot of extra dudes wandering around with nothing to do? Start a war!
People Keep Talking About Your Sex Scandal
Go ahead--wag that dog!
Oil, Oil, and More Oil
You need oil. You don't have oil. Start a war!
Narcissistic Orange Man is Sore Loser
There's no need to accept an election if you don't like the result. Might makes right! Start a war!