The war that prompted the U.S. to deal with emergency situations and learn effective measures that had implications for the future is A. Vietnam War.
The Vietnam War was a long, costly and divisive conflict. The war pitted the communist government of North Vietnam against South Vietnam.
The war was sponsored by Communist North Korea as a way of unifying North and South Vietnam to become Communist Vietnam. But the United States wanted to prevent this from happening.
Thus, the Vietnam war more than the Civil War, the American Revolution, or the Mexican American War, prompted the U.S. to deal with emergency situations and learn effective measures that had implications for the future.
Learn more about the Vietnam War at https://brainly.com/question/182779
