How has the number of slave and free states changed from 1820 and 1850 ?

California - as part of the Compromise of 1850, California was admitted to the Union as a free state. New Mexico and Utah - as part of the Compromise of 1850, the territories of New Mexico and Utah were organized without mention of slavery. By 1858, 17 free states, which included California (1850), and Minnesota (1858), outnumbered the 15 slave states.

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