I was taught about our ten year long war against the Philippines in my Marine Corps history class.

In our regular school history classes they do not mention it at all, just our shorter war with Spain. The Filipinos had been fighting against Spain before us. Neither country had any right to the Philippines.

In the Marine history it was suggested that 300,000 Filipinos, or more, died fighting us. Nothing unusual in our history of fighting within our own country.