READ: What Groups Came West?
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Mormons
Why did they come?
How did the Mormons end up in Utah?

Joseph Smith
The Church of Jesus Christ of Latter-day Saints (also known as the Mormon or LDS church) was started by Joseph Smith in 1830 in New York. Later, members of this church gathered in Nauvoo, Illinois.
Some people disliked Mormon beliefs and practices and persecuted members of this church. After a mob murdered Joseph Smith in 1844, his followers started to think about moving somewhere where they could live peacefully. Enemies were still attacking Mormons in different ways. Because of this persecution, in the cold of February 1846 the Mormons began to leave Nauvoo. They journeyed to Winter Quarters, Nebraska, and set up a temporary community.