Philippine Insurrection 1900-1902.
Multiple wars were fought in the 20th century. A Few are World War One, World War Two, Korean War, Vietnam War, and the Gulf War. All these wars involved the US Military.
The Boxer Rebellion in China and the Philippine Insurrection from 1900 to 1902.
Russo- Japanese War , Philippine- American war and Boer war.
The Civil War![EDIT] No! The Civil War was fought in the U.S. from 1861-1865.There were no U.S. wars fought in the decade of 1900-1909. The Spanish American War ended right before this decade began and World War One began in Europe in 1914. (We did not join World War One until 1918.) However, in this decade Russia and Japan were at war from 1904-1905.
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World war I, World war II, Korean war, and Vietnam war.
The Civil War.
The Spanish American war was fought for independence for Cuba in the 1900's.
The Philippine Insurrection 1899-1902. As of the 21st Century, the name has been changed to "Philippine-American War." This war was bloodier than the Spanish-American War of 1898 which had spawned it.
Bob
World War II, Pearl Harbor.