How did the Spanish-American War affect US power in Asia? The war with the Filipino rebels reduced US influence in Asia. The war made the US an important power in Asia. The war had little effect on US power in Asia. The war created opposition to the US in many Asian countries.
The best option in terms of how the Spanish-American War affected US power in Asia would be that "The war had little effect on US power in Asia," since the US only gained small territories in the region.