What does South Carolina seceded from the union mean?

South Carolina seceded from the union means that South Carolina left the United States of America. South Carolina was the first state to secede from the United States, and it did so on December 20, 1860. The secession was a result of the long-standing debate over the issue of slavery. South Carolina was a slave state, and it felt that the federal government was no longer protecting its interests. The state's secession was the start of the American Civil War, which lasted from 1861 to 1865.