The Book of Mormon is a religious history, describing the migrations of three groups of peoples to the Americas. It spans the time period of approximately 600 B.C. to 400 A.D. The first group of migrants was led by the Lord from the destruction of the Tower of Babel in Mesopotamia. The second and third groups were led by Lord to the Americas from Israel just prior to the Babylonian captivity. These latter groups kept the record, and included an account from the first group, whose remains they had found.