The origins of the American Civil War lay in the complex issues of slavery, politics, disagreements over the scope of States' rights, Manifest Destiny, sectionalism, economic competition, modernization, and competing nationalisms of the Antebellum period. Although there is little disagreement among historians on the details of the events that led to war, there is disagreement on exactly what caused what and the relative importance. There is no consensus on whether the war could have been avoided, or if it should have been avoided.