1- The United States Congress declared war on May 13, 1846. Americans from northern states and whigs (Republicans) generally opposed the war, while southern slavers and Democrats supported it.
The elements of anti-slavery in the north feared the expansion of the power of the slavers. The Whigs, in general, were interested in being able to strengthen the US economy through industrialization, not in acquiring more territory. Among the most strongly opponents in the House of Representatives was John Quincy Adams of Massachusetts. Adams for the first time made known his concern to expand the US territory in 1836 when he opposed the annexation of Texas. He continued with his arguments until 1846 for the same reason that the acquisition of territory in the south of the country would add territory to the slave states.
2- Both the agricultural sector and the textile industry were the main income producers of the state of South Carolina.
The predominance of the primary sector and the basic industry was the common denominator of the southern United States, whose economic development depended on a large percentage of African slaves, because it took a large amount of labor to develop these activities.
3- In 1860, the abolitionist Republican Abraham Lincoln won in the presidential elections of that year. South Carolina, fearing that Lincoln would definitively abolish slavery in the country, decided to separate from the United States. The state did so on December 20 of that year, being the first US state to separate itself from the rest of the country. Subsequently, ten other states would also be separated from the United States, and immediately joined to form the Confederate States of America.
