Which is the longest war in American history:

Which is the longest war in American history:
Answer: War in Afghanistan

The War in Afghanistan (2001–2021) is the longest war in U.S. history, spanning nearly 20 years, aimed at combating terrorism. Studying this highlights its role in U.S. foreign policy, the challenges of prolonged conflicts, and its geopolitical impact. It also offers insights into how wars affect global relations, providing lessons on diplomacy and conflict resolution to prevent extended military engagements.