Final answer:
People were paying attention to Fort Sumter because it marked the beginning of the American Civil War.
Step-by-step explanation:
The subject of this question is History. People were paying attention to Fort Sumter because it was a significant event that marked the beginning of the American Civil War. The fort, located in South Carolina, was attacked and occupied by Southern forces. This action heightened tensions between the North and the South, leading to a potential battle.
Learn more about Fort Sumter and the American Civil War