The document summarizes key events from 1848 to 1854 that renewed sectional tensions between the North and South in the United States. Both major parties tried to ignore the issue of slavery during the 1848 election. The discovery of gold in California transformed the state and revived the national debate over slavery in the territories. The Compromise of 1850 temporarily postponed the conflict by admitting California as a free state while strengthening the Fugitive Slave Act, but tensions continued to rise due to the Underground Railroad and southern desires to expand slavery. The Kansas-Nebraska Act of 1854 repealed the Missouri Compromise ban on slavery north of 36°30', further dividing the nation along sectional lines and bringing it closer to civil war.