What was the name of the U.S. war between the North and the South?

The U.S. war between the North and the South is known as the Civil War. This conflict took place from 1861 to 1865 and was primarily caused by issues surrounding slavery, states' rights, and economic differences between the Northern and Southern states. The war was fought between the Union (the North) and the Confederacy (the South), ultimately leading to significant changes in the nation, including the abolition of slavery and the preservation of the Union. The term "Civil War" specifically denotes this internal struggle, distinguishing it from other conflicts such as the War of 1812, the Vietnam War, and World War II, which were fought against external nations or empires.