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Lets say, for whatever reason, that after William Walker took over Baja California in 1853 he decided not to go east and try to capture Sonora as well. Instead he decided to hold his ground and fortify Baja California against attacks which allows him and his men to maintain control of it from the Mexican Government. Mexico then eventually gives up the territory due to its sparse populations and difficulty in protecting it.
How long might if take for Walker to have his Republic gain US stathood? How might a new Slave owning state in the east effect US politics around this time? How might it effect the American Civil War?