What issue divided the Mormons in Utah and the federal government?

The primary issue that divided the Mormons in Utah and the federal government was polygamy, or the practice of plural marriage. The Mormon Church, led by Brigham Young, openly practiced polygamy, which was viewed as immoral and illegal by the federal government. This conflict escalated, leading to tensions and confrontations, including the passage of the Morrill Anti-Bigamy Act in 1862, which sought to prohibit the practice. Ultimately, these disputes contributed to a broader struggle over governance and religious freedom in the Utah Territory.