2008 California Proposition 8
Proposition 8, known informally as Prop 8, was a California ballot proposition and a state constitutional amendment intended to ban same-sex marriage. It passed in the November 2008 California state elections and was later overturned by the courts and by Proposition 3, which was passed by voters in 2024.
Source: Wikipedia — 2008 California Proposition 8 (CC BY-SA 4.0)