In America, Arian and Unitarian views were also found among some Millennialist and Adventist groups, though the Unitarian Church itself began to decline in numbers and influence after the 1870s.
Di Amerika, pandangan-pandangan Arian dan Unitarian juga ditemukan di antara beberapa kelompok Milenialis dan Adventis, kendati Gereja Unitarian itu sendiri mulai mengalami penurunan jumlah penganut dan pengaruhnya setelah tahun 1870-an.