Which compromise was passed in response to the Mexican Cession?

It admitted California as a free state, left Utah and New Mexico to decide for themselves whether to be a slave state or a free state, defined a new Texas-New Mexico boundary, and made it easier for slaveowners to recover runways under the Fugitive Slave Act of 1850. Wilmot Proviso. The Wilmot Proviso was designed to eliminate slavery within the land acquired as a result of the Mexican War (1846-48). Soon after the war began, President James K ... Fearing the addition of a pro-slave territory, Pennsylvania Congressman David Wilmot proposed his amendment to the bill.