Name one war fought by the United States in the 1900s.

World War I is a significant conflict that involved the United States, and it took place primarily from 1914 to 1918, with the U.S. entering the war in 1917. This war was pivotal as it reshaped global alliances and had profound effects on international politics and society. The involvement of the United States helped turn the tide of the war in favor of the Allies, and the outcome led to major changes in the world order, ultimately setting the stage for future conflicts. Understanding the impact of World War I is crucial for recognizing its place in American history and its consequences for both the U.S. and the world during the 20th century.