The first Mormon Pioneers left their homes in Nauvoo, Illinois, and began the long trek to the Salt Lake Valley.

The Mormon Exodus from Illinois happened shortly after the death of the Church of the Latter-Day Saints leader, Joseph Smith. At the time, the church and its leaders practiced their new religion in extremely unorthodox and scandalous ways. They were all but driven out of Illinois after the church’s neighbors grew increasingly hostile towards them.

Source