In the United States, ''Unitarianism'' is also an informal name for the beliefs of a religious denomination, originally the ''American Unitarian Association.''
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The American Unitarian Association was founded in 1825, based on principles espoused in the sermons of [[William Ellery Channing]], notably an 1819 sermon entitled "Unitarian Christianity."<ref>[http://www.transcendentalists.com/unitarian_christianity.htm Unitarian Christianity], text of Channing's sermon</ref> Unitarians emerged primarily within the Congregational churches of New England, in reaction against the excessive emotionalism of the [[First Great Awakening]] (from 1734) and subsequent revivals. Unitarians were rationalists who distrusted emotionalism and saw revivals as unholy. It was originally distinct from the doctrine of [[Universalism]]. The Unitarians appealed to a Harvard-educated Boston elite, while Universalism was common in the hard-scrabble farmers of remote New England villages. Unitarians and Universalists shared a common rejection of the doctrine of [[Trinity|Trinitarianism]] held by [[Orthodox Church|Eastern Orthodoxy]] and [[Catholic Church|Roman Catholicism]].<ref>See [[Council of Chalcedon]]</ref>
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Since its 1961 merger with the Universalists, the ''American Unitarian Association,'' has been known as the ''Unitarian Universalist Association.''