I have long believed that a movement to formally recognize polygamy would eventually appear in the US, and here it is. Between the polyamory movement, polygamous subcultures, and immigration from cultures where polygamy is practiced, it was almost inevitable, particularly given the recognition/acceptance of same-sex marriage.
New York Daily News
The city of Somerville, Massachusetts became what is believed to be the first U.S. city to recognize polyamorous relationships last Thursday, after the city council passed a new domestic partnership ordinance.
The ordinance was brought before the council as a result of the coronavirus pandemic, as a way to help those who are not married to their partners still visit their loved ones if they get sick and end up in the hospital.