The Missouri compromise, as it was known, remained in force for about thirty years before being repealed by the Kansas-Nebraska Act of 1854. In 1857, the Supreme Court declared the compromise in the Dred Scott case unconstitutional, paving the way for the nation`s final path to civil war. On January 29, 1850, Senator Henry Clay presented a plan combining the main topics being debated. Its legislative package included the admission of California as a free state, the surrender of part of its northern and western territorial rights by Texas in exchange for debt cancellation, the installation of New Mexico and the Utah Territories, a ban on the import of slaves into the District of Columbia for sale, and a stricter refugee slavery law.  Clay had initially separately supported the vote on each of his proposals, but Senator Henry S. Foote of Mississippi persuaded him to combine proposals for California`s inclusion with the arrangement of Texas borders in a bill.  Clay hoped that this combination of measures would convince members of Congress in the North and South to support all laws, even if they were committed to certain provisions.  Clay`s proposal received support from some Northern Democrats and Southern Whigs, but there was no support to get the passage and debate on the bill continued.  „An Outline of American History,“ United States Information Agency. usa.usembassy.de/etexts/history/ch6.htm#compromise. After Taylor and fillmore`s death, Douglas took the lead in passing Clay`s compromise through Congress in the form of five separate bills. As part of the compromise, Texas abandoned its claims to present-day New Mexico and other states in exchange for the Federal Confederation`s assumption of Texas` public debt.
California was admitted as a free state, while the other parts of the Mexican Disposal were organized in the New Mexico Territory and the Utah Territory. Under the concept of popular sovereignty, the people of each region would decide whether slavery is permissible or not. The compromise also involved a stricter „Fugitive Slave Law“ and prohibited the slave trade in Washington, D.C.