The development of feudalism occurred in response to which event? the fall of the Western Roman Empire
the Mongol invasions
the spread of the Muslim faith
the decline of trade between Europe and the East

Since  there was not a large Native American presence,and for supporting a large population there was the potential for agriculture.

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.