When the majority of the world's remaining mutant population moved to San Francisco some were excited and others, like the Hellfire Cult, feared what would happen. Simon Trask and his anti-mutant rights group, the Humanity Now! Coalition, tried to capitalize on this fear by forming Proposition X (Mutant Breeding Act Ballot Initiative, Prop X) to legislate mutant reproductive rights. Pointing to the massacre in Cooperstown; Alaska after the first mutant birth since M-Day as precedence, Trask began to gain traction in the California state legislature to muscle Prop X to an emergency ballot vote.
While Humanity Now! began its march on San Francisco, they were met by a peaceful protest of Prop X opponents led by Beast and composed of both mutants and humans. However, Hellion and several other notorious mutants incited a riot. When mutant riots broke out in San Francisco, Norman Osborn, director of the national peace keeping organization H.A.M.M.E.R., declared martial law and sent his Avengers and his X-Men in to quell the riots and take down the X-Men leading to the events of Utopia.
- Proposition X is a fairly clear reference to the real world California law, Proposition 8, denying same sex couples marriage rights.
- The idea of legislating mutants was also explored with the Mutant Registration Act and the Superhuman Registration Act.