What major global conflict was the U.S. involved in from 1955 to 1975?

The Vietnam War was a significant global conflict that the United States engaged in from 1955 to 1975. This conflict emerged from the broader context of the Cold War, where the U.S. aimed to contain the spread of communism. The Vietnam War, particularly noted for its intense military involvement and controversial nature, saw the U.S. supporting the government of South Vietnam against the communist forces of North Vietnam and the Viet Cong.

The war had profound impacts not only on Vietnam but also on American society and politics, contributing to widespread protests and a re-evaluation of U.S. foreign policy. It symbolized a pivotal moment in the Cold War era, demonstrating the complexities of international relations and the consequences of military intervention. The duration of the conflict, coupled with its lasting effects on both Vietnam and America, solidifies its importance in U.S. history, making it the correct answer to the question regarding major global conflicts during that timeframe.