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Through Asia

The provisions of the compromise included a provision that approved California's request to enter the Union as a free state, and strengthened fugitive slave laws with the Fugitive Slave Act of 1850. The compromise also banned the slave trade in Washington, D.C. (while still allowing slavery), defined northern and western borders for Texas, while establishing a territorial government for the Territory of New Mexico that included no restrictions on whether any future state from this territory would be a free or slave state, and established a territorial government for the Territory of Utah, also with no restrictions if the territory would become a slave or free state.

A debate over slavery in the territories erupted during the Mexican–American War, as many white Southerners sought to expand slavery to the newly acquired lands and many Northerners opposed any such expansion. The debate was further complicated by Texas's claim to all former Mexican territory north and east of the Rio Grande, including areas it had never effectively controlled. These issues prevented the passage of organic acts to create organized territorial governments for the land acquired in the Mexican–American War.

In early 1850, Clay proposed a package of eight bills that would settle most of the pressing issues before Congress. Clay's proposal was opposed by President Zachary Taylor, anti-slavery Whigs like William Seward, and pro-slavery Democrats like John C. Calhoun, so congressional debate over the territories continued. The debate over the bill was among the most famous in Congressional history, where the divisions deteriorated into fistfights and the drawing of guns on the floor of Congress.

After Taylor died he was succeeded by Fillmore at which time Stephen A Douglas took the lead in passing Clay's compromise through Congress as five separate bills. Under the compromise, Texas surrendered its claims to present-day New Mexico and other states in return for federal assumption of Texas's public debt. California was admitted as a free state, while the remaining portions of the Mexican Cession were organized into the New Mexico Territory and Utah Territory. Under the concept of popular sovereignty, the white people of each territory would decide whether or not slavery would be permitted. The compromise also included a stringent Fugitive Slave Law and banned the slave trade in Washington, D.C. The issue of slavery in the territories would be re-opened by the Kansas–Nebraska Act (1854), but the Compromise of 1850 played a major role in postponing the Civil War.

Background

The Republic of Texas declared its independence from Mexico following the Texas Revolution of 1836, and, partly because Texas had been settled by a large number of Americans, there was a very strong sentiment in both Texas and the United States for the annexation of Texas by the United States. In December 1845, President James K. Polk signed a resolution annexing Texas, and Texas became the 28th state in the union. Polk, an expansionist and slave owner, sought further expansion through the acquisition of the Mexican province of Alta California, which represented new lands to settle as well as a potential gateway to trade in Asia. His administration attempted to purchase California from Mexico, but the annexation of Texas stoked tensions between Mexico and the United States. Relations between the two countries were further complicated by Texas's claim to all land north of the Rio Grande; Mexico argued that the more northern Nueces River was the proper Texan border.

In March 1846, a skirmish broke out on the northern side of the Rio Grande, ending in the death or capture of dozens of American soldiers. Soon afterward, the United States declared war on Mexico which became known as the Mexican–American War. In August 1846, Polk asked Congress for an appropriation that he hoped to use as a down payment for the purchase of California in a treaty with Mexico. This action ignited a debate over the status of future territories. A freshman Democratic Representative, David Wilmot of Pennsylvania, offered an amendment known as the Wilmot Proviso that would ban slavery in any newly acquired lands. The Wilmot Proviso was ultimately defeated in the Senate, but it inserted the slavery debate into national politics.

In September 1847, an American army under the command of General Winfield Scott captured the Mexican capital in the Battle for Mexico City. Several months later, Mexican and American negotiators agreed to the Treaty of Guadalupe Hidalgo, whereby Mexico agreed to recognize the Rio Grande as Texas's southern border and to cede Alta California and New Mexico.

The Missouri Compromise had settled the issue of the geographic reach of slavery within the Louisiana Purchase territories by prohibiting slavery in states north of the 36°30′ latitude, and Polk sought to extend this line into the newly acquired territory. However, the divisive issue of slavery blocked any such legislation. As his term came to a close, Polk signed the lone territorial bill passed by Congress, which established the Territory of Oregon and banned slavery within it. Polk decided not to seek re-election in the 1848 presidential election, and the 1848 election was won by the Whig ticket of Zachary Taylor and Millard Fillmore.

Prophetically, Ralph Waldo Emerson quipped that "Mexico will poison us", referring to the ensuing divisions that developed around the question of whether newly conquered lands would be slave or free. When Taylor was elected president in 1848, the issue was not yet apparent. Taylor was both a Whig and a slaveholder. Though Whigs were increasingly anti-slavery, Taylor's slaveholding had reassured the South, and he won handily. Taylor made a key electoral promise that he would not veto any congressional resolution on slavery. Much to the horror of Southerners, however, Taylor indicated that true to his promise, he would not even veto the Wilmot Proviso if it were passed. Tensions accelerated quickly in the fall of 1849.

Midterm elections worsened matters, as the Free Soil Party had gained 12 seats, which put it in the position to be a king-maker in the closely divided House: 105 Whigs to 112 Democrats. After three weeks and 62 ballots, the House could not elect a speaker; the main issue was slavery in the new territories. The turmoil of that period was severe, with a loaded revolver being drawn on the floor of Congress, fistfights occurred between Northerners and Southerners, and even Senator Jefferson Davis challenged an Illinois representative to a duel. Southern representatives increasingly bandied around the idea of secession. Finally, the House adopted a resolution that allowed a speaker to be elected with a plurality, and elected Howell Cobb on the 63rd ballot. As James McPherson puts it: "It was an inauspicious start to the 1850's."

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