Final answer:
Studying previously unknown events in U.S. history is important to gain a broader perspective on world history, uncover hidden stories of unsung heroes, and trace the origins of contemporary issues and societal developments.
Step-by-step explanation:
Studying previously unknown events in U.S. history is important because it allows us to gain a broader perspective on world history, uncover hidden stories of unsung heroes, and trace the origins of contemporary issues and societal developments.