When did polygamy start becoming illegal?

The U.S. government made polygamy illegal in 1862, largely in response to the LDS Church. The church, realizing that support for polygamy was likey preventing Utah’s statehood, outlawed the practice in 1890 and church founder Joseph Smith disavowed the practice in 1904.

When did bigamy become illegal in US?

501) was a federal enactment of the United States Congress that was signed into law on July 1, 1862 by President Abraham Lincoln.
Morrill Anti-Bigamy Act.

Nicknames Morrill Anti-Bigamy Act of 1862
Enacted by the 37th United States Congress
Effective July 1, 1862
Public law Pub.L. 37–126

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