The United States builds many aircraft carriers for several key reasons:

1. Power Projection: Aircraft carriers allow the U.S. to project military power globally, supporting operations far from home bases.
2. Deterrence: The presence of carriers can deter potential adversaries from aggressive actions.
3. Versatility: Carriers support a wide range of missions, including air superiority, strike operations, reconnaissance, and humanitarian aid.
4. Rapid Response: They enable rapid response to crises worldwide without relying on local bases or permissions.
5. Force Multiplication: Carriers serve as floating airbases, significantly increasing the operational reach of U.S. forces.

These factors collectively enhance the U.S. military’s strategic flexibility and global presence.