Introduction: Is polygamy legal in America?. Polygamy is generally illegal in the United States. Polygamous relationship involves having multiple spouses simultaneously, which is prohibited by laws in all 50 states. The legal stance on polygamy has evolved, shaped by historical, cultural, and religious factors.
In the early years of the United States, polygamy was practiced by some religious groups, notably the Mormons or fellows of The Church of Jesus Christ of Latter-day Saints (LDS Church). However, polygamy was scrutinized as the nation expanded, and conflicts arose over statehood and religious freedom.
Marriage, divorce proceedings, and further family law matters are governed by state law. All U.S. jurisdictions prohibit polygamy, invalidating marriages involving more than two spouses. State laws against marriage — marrying someone while still legally wedded to another person — are usually grounds for annulment.
Like a divorce, an annulment ends the marriage. However, unlike divorce, a successful action seeking annulment can render the marriage null and void from its alleged inception.
