If the U.S. ever finds out if there is going to be a new ruler in a country, we could make a deal with that country. We could lend them a lie dector if they don't have one. If they don't have one, then we teach them how to use the one we gave them. If they do have one, we could tell them they can use it to se if the new ruler's intention are to help this country, or hurt it.
This would be a great idea. Its is a way to find the perfect ruler for your country. It's another way to spread peace. Also, you won't have to worry about making a mistake and picking a bad person like Hitler.