Anti-Mormon hostility, which included mob attacks, led Brigham Young to leave the United States.
To find a new settlement, a group of Mormons left Illinois for Omaha (February 1846), setting up rest camps along the Missouri River for groups to follow
After congregating in Omaha an advance party of about 150 set off (April 1847) for the Great Salt Lake along a route north of the Oregon Trail to avoid conflict with other settlers.
Following the route set out by the advance party, a larger group set off with a clear path along the route
The main party arrived at the Great Salt Lake (August 1847), having followed the Mormon Trail laid by the advance party.
The Mormon Trail would now allow thousands of Mormons in organised wagon trains to migrate to an established settlement at the Great Salt Lake.