The Seventh-day Adventist Church came from the Millerite movement in the United States. This included people from many denominations. The Millerites started in the middle part of the 19th century. The Millerites were people who followed the teachings of William Miller. Miller preached that Jesus is coming very soon, in the Second Coming or Second Advent. The church name "Adventist" came from the word "Advent." The Seventh-day Adventist Church started in 1863.