Answer: C. Reassessed its role as “policemen” of the world.
Explanation: I’m fairly certain your answer is C as the Vietnam War happened because of the United States realizing they stepped into WW2 a bit too late. Also, it was messy from start to finish. The Vietnam War caused a lot of controversy because people thought we had no business being in other people’s business type thing and it destroyed the US economy. I hope I helped!!