US bans Polygamy.
"In 1862 Congress adopted the Morrill Act for the Suppression of Polygamy (also known as the Morrill Anti-bigamy Act), named for its sponsor, Justin S. Morrill, R-Vt. The act was passed in response to the perceived threat posed by polygamy, which was practiced by the Church of Jesus Christ of Latter-day Saints (Mormons) in Utah."
https://www.mtsu.edu/first-amendment/ar ... ct-of-1862