The extension of slavery into new territories and states were an difficulty as some distance returned because the northwest ordinance of 1784. whilst the slave territory of missouri sought statehood in 1818, congress debated for two years before arriving upon the missouri compromise of 1820. this became the first of a sequence of political deals that resulted from arguments between seasoned-slavery and antislavery forces over the enlargement of the “bizarregroup,” as it turned into recognized, into the west. the stop of the mexican-american war in 1848 and the kind of 500,000 square miles (1.three million rectangular km) of latest territory that america received because of it brought a new feel of urgency to the dispute. increasingly northerners, pushed through a sense of morality or an hobby in protecting loose labour, came to believe, within the 1850s, that bondage needed to be eradicated. white southerners feared that limiting the enlargement of slavery might consign the group to positive loss of life. over the path of the decade, the two sides have become increasingly polarized and politicians less able to incorporate the dispute thru compromise. when abraham lincoln, the candidate of the explicitly antislavery republican birthday party, won the 1860 presidential election, seven southern states (south carolina, mississippi, florida, alabama, georgia, louisiana, and texas) accomplished their risk and seceded, organizing because the accomplice states of america.