Unitarian Universalism is a liberal religious tradition that was formed from the consolidation of two religions: Unitarianism and Universalism. In America, the Universalist Church of America was founded in 1793, and the American Unitarian Association in 1825. After consolidating in 1961, these faiths became the new religion of Unitarian Universalism through the Unitarian Universalist Association (UUA).
Both religions have long histories and have contributed important theological concepts that remain central to Unitarian Universalism. To learn more about the history of Unitarian Universalism, please see the pamphlet, “Unitarian Universalist Origins: Our Historic Faith.”
Since the merger of the two denominations in 1961, Unitarian Universalism has nurtured its Unitarian and Universalist heritages to provide a strong voice for social justice and liberal religion.
Taken from http://www.uua.org/beliefs/history
For more information about the history of Unitarian Universalism, please visit the Unitarian Universalit Association (UUA) website by clicking here.