Unitarianism begins in Boston.

King’s Chapel becomes the first Unitarian congregation in the U.S. when it adopts what is then called English Unitarianism (as opposed to the Congregational Unitarianism later practice by Rev. William Ellery Channing), which is a more liberal form of Congregationalism. It replaces the concept of a Holy Trinity with an emphasis on the unity of God, downplays predestination and sin, and emphasizes the importance of individual conscience. Henry Adams later writes, “Nothing quieted doubt so completely as the mental calm of the Unitarian clergy. Doubts were a waste of thought . . . Boston had solved the universe.”