Flatbush Unitarian Church (Brooklyn, New York, N.Y.).

Although the doctrines of Unitarianism come from 17th century Europe, Unitarianism in America during the 19th century was influenced by several American theologians including Boston based preacher William Ellery Channing (1780-1842). Channing was one of the first theologians to introduce the principles of Unitarianism to New Yorkers.

In 1819, in response to an address given by Channing in the City of New York, the first Unitarian church was established in the city. Originally formed as the First Congregational Church (later renamed Church of the Devine Unity and finally, All Souls Church) its first meeting house was located on Chambers Street in today's lower Manhattan.

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