Irish Americans were powerful in the Democratic party, and groups such as Clan na Gael opposed going to war alongside their enemy Britain, especially after the violent suppression of the Easter Rising of 1916. Wilson won them over in 1917 by promising to ask Britain to give Ireland its independence. Wilson had won the presidential election of 1916 with strong support from German-Americans and Irish-Americans, largely because of his slogan "He kept us out of war" and the longstanding American policy of isolationism. At the Paris Peace Conference in 1919, however, he reneged on his commitments to the Irish-American community, who vehemently denounced him. His dilemma was that Britain was his war ally. Events such as the anti-British Black Tom and Kingsland Explosions in 1916 on American soil (in part the result of wartime Irish and German co-ordination) and the Irish anti-conscription crisis of 1918 were all embarrassing to recall in 1920.