There are many synonyms for the phrase "war to end war," which was first popularized during World War I. Some of these include "peace through strength," "every war fought must be the last," "the final war," and "never again." These phrases all convey the same sentiment, that war should ultimately lead to lasting peace and that violence must be avoided in order to achieve this goal. Ultimately, whatever words are used to describe this concept, the message remains the same: our ultimate goal as humans should be to create a world where war is no longer necessary.