Peace through strength
Peace through strength is a principle which stands in recognition that having the ability to repel a bad actor is the best way to preserve peace. The phrase was popularized by Ronald Reagan, however, has been associated with President George Washington and may have been described by leaders going as far back as the Roman Emperor Hadrian.
In Federalist No. 4, John Jay argued for peace through strength by pointing out that union (of the 13 states) "and a good national government as necessary to put and keep them in SUCH A SITUATION as, instead of INVITING war, will tend to repress and discourage it".