What economic lesson did the United States learn from the Vietnam War during the 1970s?

The Vietnam War increased federal spending while the government was also funding major domestic social programs. The United States learned that trying to pay for both contributed to inflation and economic strain. This makes “The economy cannot fund both a large war and major social programs” the best answer; the lesson was not simply that any major war is unaffordable.

AI-written and checked against the verified answer.