Jane Addams made significant contributions to social reform and community service in the United States. As a pioneer of the Settlement House Movement, she co-founded Hull House in Chicago to provide services to immigrants and the poor. Addams advocated for various social issues, including labor rights, women's suffrage, and peace during and after World War I. Her efforts in promoting social justice and civic engagement earned her the Nobel Peace Prize in 1931, marking her as a key figure in American social reform.