1) Members of the Church of Jesus Christ of Latter-day Saints faced persecution and violence in the 1830s-1840s in Ohio, Missouri, and Illinois, culminating in the death of their leader Joseph Smith in 1844. 2) In 1847, seeking religious refuge, thousands of Mormons embarked on a journey led by Brigham Young to establish a settlement in Salt Lake Valley, Utah. 3) The California Gold Rush beginning in 1848 attracted thousands of prospectors, known as "forty-niners", fueling rapid population growth in California through the discovery of gold and other precious metals in the region.