Which major event of the war occurred in the Philippines?

The US battleship USS Maine sunk.

The US supported rebels against the Spanish.

The US defeated the Spanish fleet at Manila Bay.

The US defeated the Spanish fleet at Santiago Bay.

The major event of the war that occurred in the Philippines was the American victory over the Spanish fleet at Manila Bay.

Explanation:

The Battle of Manila Bay took place on May 1, 1898 during the Spanish-American War. The American Asian Fleet led by commodore George Dewey met the Spanish Asian Fleet led by Admiral Patricio Montojo y Pasaron. The battle took place in the Bay of Manila in the Philippines and was the first major confrontation of the war. The result was the total destruction of the Spanish Fleet.

The US supported rebels against the Spanish