Utopia
2009Anti-mutant riots erupt in San Francisco after Proposition X threatens to regulate mutant breeding, and Norman Osborn seizes the opportunity to create his own "Dark X-Men." Cyclops counters by raising Asteroid M from the ocean floor, establishing the island nation of Utopia as a sovereign mutant homeland off the coast of San Francisco. A turning point that transforms the X-Men from a school into a nation.
2 core issues, 2 optional tie-ins/crossovers

The Uncanny X-Men #513
Riots in San Francisco; Osborn forms the Dark X-Men with Emma Frost as his figurehead

The Uncanny X-Men #514
Emma Frost plays double agent; Cyclops launches his counter-plan to raise Asteroid M
Tie-InX-Men: Legacy #226
Rogue and Gambit deal with the San Francisco crisis
Tie-InX-Men: Legacy #227
Legacy team supports the Utopia operation