Answer:
The answer to the question: Why were Sherman´s troops so excited about entering South Carolina during the Civil War, is, that taking over South Carolina , especially Columbia, meant taking over the very symbol of the rebellion, as South Carolina was the first state to secede and it was where the first shot of the war was shot against a Federal garrison, in 1861.
Explanation:
During the Civil War, one of the ideals of the Union generals, especially William Tecumseh Sherman and Ulysses S. Grant and President Abraham Lincoln, was to cut the conflict short, and to do so, they decided to swipe the south and cause trouble for civilians, to press the Confederates into giving in. This is the reason why the men of Sherman decide to sweep through Georgia, and especially South Carolina, causing as much trouble to civilians as possible. When the Union army finally reaches Columbia, Sherman and his men are really joyous as Columbia, and the whole of South Carolina, are the very symbol of the rebellion, and the place where the first shot of the war was fired.
