The AUA was formed in 1825 in the aftermath of a split within New England's Congregational churches between those congregations that embraced Unitarian doctrines and those that maintained Calvinist theology.[2]
According to Mortimer Rowe, the Secretary (i.e. chief executive) of the British Unitarians for 20 years, the AUA was founded on the same day as the British and Foreign Unitarian Association: "By a happy coincidence, in those days of slow posts, no transatlantic telegraph, telephone or wireless, our American cousins, in complete ignorance as to the details of what was afoot, though moving towards a similar goal, founded the American Unitarian Association on precisely the same day—May 26, 1825."[3]
Beginning in 1825 the AUA published "tracts" for free distribution[4][5] and in the 20th century "pamphlets" for free distribution.[6] The AUA also published books and several book series including The Devotional Library,[7] The Theological Library,[8] Memorable Sermons[9] and The Beacon Series: A Graded Course of Study for the Sunday School.[10][11]