American Civil War: In Charleston, South Carolina, Union batteries and ships bombard Confederate-held Fort Sumter.

Charleston is the most populous city in the U.S. state of South Carolina. The city lies just south of the geographical midpoint of South Carolina's coastline on Charleston Harbor, an inlet of the Atlantic Ocean formed by the confluence of the Ashley, Cooper, and Wando rivers. Charleston had a population of 150,227 at the 2020 census, while the Charleston metropolitan area, comprising Berkeley, Charleston, and Dorchester counties, has an estimated 870,000 residents. It ranks as the third-most populous metropolitan area in the state and the 71st-most populous in the U.S. It is the county seat of Charleston County.

The Union was the central government of the United States during the American Civil War. Its civilian and military forces resisted the Confederacy's attempt to secede following the election of Abraham Lincoln as president of the United States. Lincoln's administration asserted the permanency of the federal government and the continuity of the United States Constitution.

Fort Sumter is a historical sea fort located near Charleston, South Carolina. Constructed on an artificial island at the entrance of Charleston Harbor in 1829, the fort was built in response to the War of 1812, which had exposed the inadequacy of existing American coastal fortifications to defend against naval attacks. Fort Sumter was still incomplete in 1861 when it was attacked by Confederate Forces during the Battle of Fort Sumter on April 12, sparking the American Civil War; the fort was severely damaged during the battle and left in ruins. Although there were some efforts at reconstruction after the war, Fort Sumter as conceived was never completed. Since the middle of the 20th century, the fort has been open to the public as part of the Fort Sumter and Fort Moultrie National Historical Park, operated by the National Park Service.