But nevertheless, I always remember the main spark of World War I. And I know a lot of teachers use this technique, so you can hang your hat on it. It's a tried and true method. Main is going to be the word, and here we go, M-A-I-N, boom. Main stands for militarism. And what that means is, really in Europe there was a race to build weapons. And all the words are linked, so I'll say imperialism.