Whether you call it the Philippine–American War, the Philippine Insurrection, or the Tagalog Insurgency, there's a good chance you don't remember learning about this brutal conflict in school. 

After decisively winning the Spanish-American War of 1898, the United States found itself in control of a few new territories, including Puerto Rico, Guam, and the Philippines. However, already displeased with their history of Spanish rule, the Filipino people signed a declaration of independence, wishing to become the First Philippine Republic.

Ironically, the United States elected not to recognize this declaration, and a war for independence began in 1899. 

Over the course of the next few years the United States killed over 200,000 Filipino civilians, with up to a million dying from starvation and disease. The US also rounded up prisoners into torturous concentration camps and conducted scorched Earth tactics on villages and homes. 

Although the Philippines eventually earned its independence after World War II, the Philippine–American War finished as one of America's biggest foreign policy black eyes.