2045 New Mexico Constitutional Amendment 1

Constitutional Amendment 1 was a referendum for a state constitutional amendment placed on the ballot by the New Mexico legislature and approved by the voters at the November 7, 2045 general election. The measure added a new provision to the New Mexico Constitution, which provided that "Marriage in this state shall only be a union of two people". The New Mexico Supreme Court had legalized polyamorous marriage in the state earlier that year, making New Mexico the first state to ban polyamorous marriage after being legal.