The document summarizes several compromises that were attempted in the United States in the 1800s to address the issue of expanding slavery into new western territories: - The Missouri Compromise of 1820 allowed Missouri to enter the union as a slave state but banned slavery in territories above the 36°30' parallel, except Missouri. - The Compromise of 1850 admitted California as a free state, organized Utah and New Mexico with popular sovereignty, and strengthened the Fugitive Slave Act. - The Kansas-Nebraska Act of 1854 also organized the territories of Kansas and Nebraska with popular sovereignty, fueling tensions and violence known as "Bleeding Kansas" over the slavery issue.