The answer is: Utah
The first Americans to settle permanently in the Utah region were the Mormons. Mormons are members of a religious group called the Church of Jesus Christ of Latter-day Saints. This Church had been instituted in 1830, near Fayette, New York, by Joseph Smith. After his murder in 1844, Brigham Young became the leader of most Mormons. Because of the great religious persecution they suffered, Mormons began to move from one region to another seeking freedom and religious tolerance, passing through Ohio, Illinois and Missouri. However, wherever they went there was religious persecution. In 1846, Young decided to make an expedition to the North-West North American, and to look for an isolated and little or not inhabited region, where the group could enjoy religious tolerance. In 1847, Young and his expedition arrived at the Great Salt Lake, where they settled. A year later, in 1848, by the Treaty of Guadalupe Hidalgo, the United States annexed Utah, after its victory over Mexico during the US intervention in Mexico.
Young quickly planned communities for all his followers. The news of the success of the settlement in the region caused thousands of people -mainly Mormons- to settle in the region of the Great Salt Lake and its estuaries, especially north of the current state, where many settled in valleys and began to irrigate these valleys , promoting the practice of agriculture.