Final answer:
Columbia is the capital and largest city of South Carolina, located at the confluence of the Saluda and Broad Rivers, and has played a significant role in the state's history.
Step-by-step explanation:
The capital and largest city of South Carolina, located at the confluence of the Saluda and Broad Rivers, is Columbia. This city serves as a central hub of activity and history within the state. Columbia is not only the capital but also embodies a significant portion of the state's historical development, serving as a key site for events such as the Siege of Charleston during the American Revolution. This city has also been a vital center of trade and agriculture throughout its history, especially with its proximity to the Charleston port and the economic activities associated with it.