Adventism began as a 19th-century apocalyptic movement (Apocalypticism 3) in the United States. It led directly to the development of the Advent Christian Church, the Church of God of the Abrahamic Faith, and, the largest of the Adventist denominations, the Seventh-day Adventist Church (SDA). Other groups influenced by, but less directly connected with, Adventism include the Jehovah’s Witnesses and the Worldwide Church of God.