Why did South Carolina secede (separate) from the US in 1860?

South Carolina seceded from the United States in 1860 due to several reasons:

1. Slavery: The primary reason was the issue of slavery. South Carolina was a slave state and its economy was heavily dependent on agriculture, particularly cotton, which was labor-intensive. The state's leaders believed that the abolition of slavery, which was being pushed by the Northern states, would severely damage their economy.

2. States' Rights: South Carolina believed in the doctrine of states' rights, which held that the power of the federal government should be limited and that the states should have the right to govern themselves. They felt that the federal government was overstepping its bounds, particularly with regards to the issue of slavery.

3. Election of Abraham Lincoln: The election of Abraham Lincoln as President in 1860 was the final straw for South Carolina. Lincoln was a member of the Republican Party, which was anti-slavery. His election led South Carolina's leaders to believe that the federal government would soon move to abolish slavery.

4. Secession: On December 20, 1860, South Carolina became the first state to secede from the Union. This was done in a bid to protect their rights, particularly the right to own slaves. The secession led to the formation of the Confederate States of America and ultimately, the American Civil War.