Answer:
Since there was not a large Native American presence,and for supporting a large population there was the potential for agriculture.
Step-by-step explanation:
After the murder of Joseph smith, the founder and prophet of Mormons Brigham Young, in Illinois, became a leader of Mormon and lead them to Utah due to continues mob attack.
Although, the settlement is salt lake but also, they were able to practice agriculture and they (Mormon) saw an opportunity in becoming the majority since there was limited numbers of native American.