Which war was fought by the United States during the 1900s?

World War I is indeed a significant conflict that the United States participated in during the 1900s, specifically from 1917 to 1918. This war marked a turning point in U.S. military history, as the nation emerged as a global power with a substantial military presence. The involvement in World War I was prompted by various factors, including unrestricted submarine warfare and the Zimmermann Telegram, which collectively influenced the U.S. to join the Allies in fighting against the Central Powers.

The significance of World War I also lies in its lasting impact on U.S. foreign policy and military engagement worldwide. The war reshaped global dynamics, leading to the creation of the League of Nations and setting the stage for future conflicts, including World War II. Understanding the United States' role in this war helps contextualize the country's military and diplomatic history in the 20th century.

The other wars listed occurred in different time frames: the Civil War was fought from 1861 to 1865, the Spanish-American War occurred in 1898, and the War of 1812 was fought between 1812 and 1815. None of these wars were fought during the 1900s, which further emphasizes why World War I stands out as