Turning point of the American Civil War

There is widespread disagreement over the turning point of the American Civil War. The idea of a turning point is an event after which most observers would agree that the eventual outcome was inevitable. While the Battle of Gettysburg is the most widely cited (often in combination with the Siege of Vicksburg, which concluded a day later), there are several other arguable turning points in the American Civil War. Possibilities are presented here in chronological order. Only the positive arguments for each are given.