what is the main reason the us civil war started
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 (or 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.