World War I	1914-1918 - American forces joined in the conflict against Germany in the war that is remembered for the trenches and gas attacks.
Boxer Rebellion	1900-1901 - US troops joined a multinational force in order to stop the terrorist activities of the I Ho Ch'uan in China.
Philippine Insurrection	1899-1902 - American forces suppressed the revolution in the Philippines in a war that lasted longer than the one that was fought to gain them.
Spanish-American War	Apr.-Aug. 1898 - The US gained Puerto Rico, the Philippines and Guam, establishing itself as an imperial power with the defeat of Spain.

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