 He becomes the first president to leave the country. He goes to Paris to negotiate the Treaty of Versailles that ends the war. At his instance, they put in the treaty the League of Nations, which was his idea. So they do it. He comes back to America, finds out that the League of Nations is not at all popular, and it's got to be confirmed by the U.S. Senate. So he takes it upon himself to make a nationwide cross-country train trip