California came into the Union as a free, not a slave, state.

Eventually,in 1850, Ron. But it was originally siezed -along with New Mexico & parts of present day Utah, Nevada, Colorado, and Arizona- in 1848 as a result of U.S. aggression in the Mexican War- a war primarily instigated by Pres. Polk (a Southern sympathizer) at the behest and in the interest of the Slaveocracy.

Recall also the "Republic of Texas" was created because Mexico had outlawed slavery...