The Antebellum Period in American history is generally considered to be the period before the Civil War and after the War of 1812, although some historians expand it to all the years from the adoption of the Constitution in 1789 to the beginning of the Civil War. It was characterized by the rise of abolition and the gradual polarization of the country between abolitionists and supporters of slavery. During this same time, the country’s economy began shifting in the north to manufacturing as the Industrial Revolution began, while in the south, a cotton boom made plantations the center of the economy. The annexation of new territory and western expansion saw the reinforcement of American individualism and of Manifest Destiny, the idea that Americans and the institutions of the U.S. are morally superior and Americans are morally obligated to spread these institutions.
The first battle of the war, Lexington marked the beginning of the American Revolution. Although Lexington and Concord were considered British military victories, they gave a moral boost to the American colonists.
