Which area of the US did most of the civil war take place?

Most of the Civil War took place in the Southern United States, where key battles occurred in states such as Virginia, Tennessee, Georgia, and Mississippi. The Eastern Theater, particularly Virginia, saw significant military engagements like the Battle of Gettysburg and the Siege of Petersburg. The Western Theater also experienced critical battles, notably the Siege of Vicksburg and the Battle of Shiloh. Overall, the conflict primarily unfolded in regions aligned with the Confederacy.