Which major conflicts did the United States participate in during the 1900s?

The chosen answer highlights significant conflicts that the United States engaged in during the 1900s, specifically World War I, World War II, and the Vietnam War. Each of these wars had a profound impact on U.S. foreign policy, military strategy, and domestic life.

World War I occurred from 1914 to 1918, with the U.S. entering in 1917. This conflict marked the U.S.'s emergence as a global power and set the stage for its subsequent international involvement.

World War II, spanning from 1939 to 1945, saw the U.S. heavily involved on multiple fronts, enhancing its status as a superpower and leading to significant changes in the global political landscape.

The Vietnam War, which unfolded from the late 1950s into the 1970s, represented a deeply controversial engagement that greatly affected American society and politics, including widespread protests and shifts in public opinion regarding military intervention.

These three conflicts exemplify the U.S.'s military engagements throughout the century, differing in context, scale, and outcomes, but collectively highlighting pivotal moments in U.S. history.