The American Peace Society is a pacifist group founded upon the initiative of William Ladd, in New York City, May 8, 1828. It was formed by the merging of many state and local societies, from New York, Maine, New Hampshire, and Massachusetts, of which the oldest, the New York Peace Society, dated from 1815. Ladd was an advocate of a "Congress and High Court of Nations." The society organized peace conferences and regularly published a periodical entitled Advocate of Peace. The Society was only opposed to wars between nation states; it did not oppose the American Civil War, regarding the Union's war as a "police action" against the "criminals" of the Confederacy. Its most famous leader was Benjamin Franklin Trueblood (1847–1916), a Quaker who in his book The Federation of the World (1899) called for the establishment of an international state to bring about lasting peace in the world. In 1834 the headquarters of the society were removed to Hartford, in 1834 to Boston, Massachusetts, in 1911 to Washington, D.C. The group is now based in Washington. Its official journal is World Affairs.
Advocate of Peace. Published in Hartford: v.1-2 (1834–1836). Published in Boston: v.3-4 (1839–1842); v.11 (1854). New series v.7-9 (1876–1878). Published in Washington, DC: v.84 (1922). Also called Advocate of Peace Through Justice
Thomas Hancock. The principles of peace: exemplified in the conduct of the Society of Friends in Ireland, during the rebellion of the year 1798, with some preliminary and concluding observations. 1843
Walter Channing. Thoughts on peace and war: An address delivered before the American Peace Society at its annual meeting, May 27, 1844.