During the time period between 1830 and 1860, the North and South had different ideas on slavery. The North tended to lean toward the liberation of slaves, while the South was very pro-slavery due to its dependence on the labor in a very agricultural area. The idea of Manifest Destiny, the belief that it is the United States’ God-given right to expand the nation from coast to coast, was enforced under the James K. Polk administration. Under Polk, The U.S. underwent the annexation of Texas, the Mexican-American War, and the Oregon negotiation with Great Britain in 1846. Through the Mexican-American War, the United States received a lot of Southwestern land with the Mexican Cession under the Treaty of Guadalupe of 1848. Later, the U.S. also underwent