Slavery would have been permitted in these territories. (Don't know if it happened.)
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Under the 1850 Compromise, New Mexico and Utah were allowed in as slave-states, in exchange for California as free soil. After that, Kansas and Nebraska were to be admitted on a local vote on slavery ('Popular Sovereignty'). This resulted in bloodshed that foreshadowed the Civil War.
New Mexico and Utah
Minnesota (1858), Oregon (1859), Kansas (1861), West Virginia (1863), Nevada (1864), Nebraska (1867), Colorado (1876), North Dakota (1889), South Dakota (1889), Montana (1889), Washington (1889), Idaho (1890), Wyoming (1890), Utah (1896), Oklahoma (1907), New Mexico (1912), Arizona (1912), Alaska (1959), and Hawaii (1959) joined the union after 1850.
The Kansas-Nebraska Act served to negate the principles laid down in the Missouri Compromise of 1820. It allowed the residents of Kansas and Nebraska to vote on whether to be free or slave states.
Texas would relinquish the land it was arguing with Mexico over but would receive ten million dollars in compensation (which it would use to pay off its debts to Mexico); the slave trade would be abolished in Washington, D.C., though slavery itself was still permitted; California was admitted as a free state; and the Fugitive Slave Act, which punished people harboring fugitive slaves and allowed for the return of those slaves to their masters was passed.