Final answer:
South Carolina seceded from the United States because they saw Lincoln's claim to end the expansion of slavery as a threat to their way of life and economic prosperity.
Step-by-step explanation:
South Carolina felt the need to secede from the United States despite Lincoln's claim to end the expansion of slavery because they saw it as a threat to their way of life and economic livelihood. Slavery was deeply ingrained in the Southern society and economy, and any limitation on its expansion could potentially jeopardize their power and prosperity. Additionally, the Southern states believed in the principle of states' rights and felt that the federal government was encroaching on their sovereignty.
Learn more about Causes of the Civil War