Original: Since the 19th century, several Evangelical or Revivalist movements adopted an elevated subordinationist theology (best described as Nontrinitarianism, rather than Unitarianism).
Simplified: See his famous sermon, "Unitarian Christianity" in The Works of W.E. Channing, D.D (1841) Since the 19th century, several Evangelical or Revivalist movements also used an elevated subordinationist theology. This can be best described as Nontrinitarianism,  rather than Unitarianism.