Why did South Carolina sign the constitution?

South Carolina signed the Constitution in 1787 primarily to ensure a stronger federal government that could provide stability and protection for the state, particularly in matters of trade and defense. The state leaders believed that joining the new union would help secure their economic interests and protect against external threats. Additionally, South Carolina sought to protect its institution of slavery, which was a crucial part of its economy, and believed that a robust federal government would safeguard this system. Ultimately, signing the Constitution was seen as a means to enhance both security and prosperity for South Carolina.