The Mormon Pioneer Movement refers to the migration of members of The Church of Jesus Christ of Latter-day Saints, commonly known as Mormons, from the eastern United States to the western territories in the mid-1800s. This movement was largely driven by the search for religious freedom and safety from persecution, as Mormons faced significant opposition in places like Illinois and Missouri. Beginning in 1846, thousands of Mormons traveled westward, with many settling in the Salt Lake Valley in present-day Utah. Led by Brigham Young, the pioneers established communities, farms, and infrastructure, significantly shaping the region's development. The movement is a key part of Mormon history and American westward expansion.