the legality of polygamy (having multiple spouses simultaneously) varies depending on the laws of individual states in the United States. In the US, polygamy is generally illegal. Most states have laws prohibiting individuals from being married to more than one person at a time. These laws apply to all individuals, regardless of their religious beliefs.
Both Islam and some sects of Mormonism historically allowed or practiced polygamy. However, the practice of polygamy is not widely accepted or practiced by mainstream Mormon groups today. The Church of Jesus Christ of Latter-day Saints (LDS Church), which represents the largest Mormon denomination, abandoned the practice of polygamy in the late 19th century and now strictly prohibits it. There are, however, some smaller splinter groups and independent sects that continue to practice polygamy.
It's important to note that regardless of religious beliefs, all individuals living in the United States must adhere to the country's laws and regulations, including those related to marriage and family. Engaging in polygamous marriages can have legal consequences, including potential criminal charges.
If someone wishes to enter into multiple marriages or has concerns related to their religious beliefs and the law, it is essential to seek legal advice from an attorney familiar with family law in their specific state. This will ensure a clear understanding of the legal implications and potential consequences of their actions.