18th and 19th century Unitarianism grew out of New England Puritanism, and the old line Unitarian churches in New England still have that flavor. It's spread far afield since then and picked up other influences.
ETA: the sister of a friend of mine is a Unitarian minister in a small town in Massachusetts. She's a cajun, originally from Lake Charles
This post was edited on 3/27 at 1:03 am