The fourth major war in contemporary U.S.history was

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The War on Terror, which began after the attacks on September 11, 2001, is considered the fourth major war in contemporary U.S. history. The other options listed were also significant events in U.S. history, but they do not fit the criteria for being the fourth major war. The Second World War was the biggest and most significant war in U.S. history, while the Cold War was a prolonged ideological conflict that never escalated into a full-scale military conflict. The War on Drugs was a campaign to reduce drug use and trafficking, but it did not involve a declaration of war or a full-scale military operation.

The Fourth Major War in Contemporary U.S.history Was