Addams was the co-founder and president of the Women's Peace Party (1915). In 1915 she attended the Women's Peace Conference at The Hague, and she was elected president of the International Committee of Women for Permanent Peace. After the conference Addams and several of the delegates went on a peace mission to the European political leaders and to the American president. Addams was elected president of the newly formed Women's International League for Peace and Freedom at the second Women's Peace Conference in 1919.
Addams founded several settlement houses, most notably Hull House in Chicago. Her aim was to improve the living conditions of immigrants and working class people through educational and philantropic activities.