He was a supporter of the League of Nations; he indorsed woman suffrage and was a strong advocate of civil-service reform for the post-office and consular appointments.
In collaboration with Mrs Elizabeth Cady Stanton, Mrs Matilda Joslyn Gage, and Mrs Ida Husted Harper, she published The History of Woman Suffrage (4 vols., New York, 1884-1887).
She was prominent in the anti-slavery and woman suffrage agitations in Massachusetts, and wrote Massachusetts in the Woman Suffrage Movement (1881).
Anthony and Mathilda Joslyn Gage she wrote The History of Woman Suffrage (3 vols., 1880-1886).
She was one of the organizers of the American Woman-Suffrage Association and of the Association for the Advancement of Women (1869), and in 1870 became one of the editors of the Woman's Journal, and in 1872 president of the New England Women's Club.