Vietnam War: A long, costly armed conflict that pitted the communist regime of North Vietnam and its southern allies against South Vietnam and its principal ally, the United States.
Philippine-American War: A war between the United States and Filipino revolutionaries from 1899 to 1902, an insurrection that may be seen as a continuation of the Philippine Revolution against Spanish rule.
Korean War: A war fought between North Korea, which was supported by China, and South Korea, which was principally supported by the United States.