disagreements involving slavery and states' rights were two of the main causes of
the American Civil War
title: Issues of the American Civil War text: and later secession. The most controversial right claimed by Southern states was the alleged right of Southerners to spread slavery into territories owned by the United States. Under Lincoln's leadership, the war was fought to preserve the Union. With slavery so deeply divisive, Union leaders by 1862 reached the decision that slavery had to end in order for the Union to be restored. Union war evolved as the war progressed in response to political and military issues, and historians do not use them to explain the causes of the war. The key new issues were the elimination of slavery and title: American Civil War text: white men aged 18–40. The causes of secession were complex and have been controversial since the war began, but most academic scholars identify slavery as a central cause of the war. James C. Bradford wrote that the issue has been further complicated by historical revisionists, who have tried to offer a variety of reasons for the war. Slavery was the central source of escalating political tension in the 1850s. The Republican Party was determined to prevent any spread of slavery, and many Southern leaders had threatened secession if the Republican candidate, Lincoln, won the 1860 election. After Lincoln won, many title: Issues of the American Civil War text: a shield against a numerical majority of Northerners. When the Civil War began, neither civil rights nor voting rights for blacks were stated as goals by the North. They became important afterward during Reconstruction. At first, though there was pressure to do so, not even the abolition of slavery was stated as a goal. While controversy over the morality of slavery could be contained, it was the issue of the expansion of slavery into the territories that made the conflict irrepressible. Slavery was at the root of economic, moral and political differences that led to control issues, states' rights and title: States' rights text: States, its Constitution, and treaties made under it, are the supreme law of the land" and for greater caution adds, "that the judges in every State shall be bound thereby, anything in the Constitution or laws of any State to the contrary notwithstanding." Over the following decades, another central dispute over states' rights moved to the forefront. The issue of slavery polarized the union, with the Jeffersonian principles often being used by both sides—anti-slavery Northerners, and Southern slaveholders and secessionists—in debates that ultimately led to the American Civil War. Supporters of slavery often argued that one of the rights of title: Origins of the American Civil War text: Origins of the American Civil War Historians debating the origins of the American Civil War focus on the reasons why seven Southern states declared their secession from the United States (the Union), why they united to form the Confederate States of America (simply known as the "Confederacy"), and why the North refused to let them go. While most historians agree that conflicts over slavery caused the war, they disagree sharply regarding which kinds of conflict—ideological, economic, political, or social—were most important. The primary catalyst for secession was slavery, most immediately the political battle over the right of Southerners to bring