Thomas Woodrow Wilson (1856–1924) was a member of the Democrats, Governor of New Jersey, and the President of Princeton University. From 1913 to 1921, he was the 28th President of the United States. During the First World War, Wilson initially attempted to keep the USA neutral, but later changed his mind. In 1917, the United States entered the war. Despite Wilson's efforts, the US senate refused to ratify the Treaty of Versailles in 1919 and, finally, in 1920. For this reason, the US never joined the League of Nations although this organization was essentially Wilson's project.