At the outbreak of World War I in 1914, the U.S. declared neutrality as Wilson tried to negotiate a peace between the Allied and Central Powers. He narrowly won re-election in the 1916 United States presidential election, boasting how he kept the nation out of wars in Europe and Mexico. In April 1917, Wilson asked Congress for a declaration of war against Germany in response to its policy of unrestricted submarine warfare that sank American merchant ships. Wilson nominally presided over war-time mobilization and left military matters to the generals. He instead concentrated on diplomacy, issuing the "Fourteen Points" that the Allies and Germany accepted as a basis for post-war peace. He wanted the off-year elections of 1918 to be a referendum endorsing his policies, but instead the Republicans took control of Congress. After the Allied victory in November 1918, Wilson went to Paris where he and the British and French leaders dominated the Paris Peace Conference. Wilson successfully advocated for the establishment of a multinational organization, the League of Nations. It was incorporated into the Treaty of Versailles that he signed. Wilson had refused to bring any leading Republican into the Paris talks, and back home he rejected a Republican compromise that would have allowed the Senate to ratify the Versailles Treaty and join the League. Wilson had intended to seek a third term in office but suffered a severe stroke in October 1919 that left him incapacitated. His wife and his doctor controlled Wilson, and no significant decisions were made. Meanwhile, his policies alienated German and Irish Democrats and the Republicans won a landslide in the 1920 presidential election. Scholars have generally ranked Wilson in the upper tier of U.S presidents, although he has been criticized for supporting racial segregation. His liberalism nevertheless lives on as a major factor in American foreign policy, and his vision of ethnic self-determination resonated globally.