Before he was President, Eisenhower was a general. What war was he in?

Dwight D. Eisenhower served as a general during World War II, which is the reason this answer is correct. He played a significant role in the war as the Supreme Commander of the Allied Expeditionary Force in Europe. He was responsible for planning and executing major operations, including the D-Day invasion of Normandy in June 1944. His leadership and strategic decisions contributed to the defeat of Axis powers in Europe, solidifying his reputation as a military leader prior to his presidency.

While Eisenhower had some involvement in World War I, it was not in a commanding role that defined his military career. The Korean War occurred after World War II and he was president during part of that time but was not directly involved as a military leader at that point. The Vietnam War also started after World War II and Eisenhower did not serve in that conflict, as he was out of office by the time it escalated. Understanding these historical contexts helps clarify why World War II is the correct answer.