Question

which argument is used by opponents of u.s. membership in the united nations? the united nations is expensive and has failed to prevent international aggression. the united nations provides a forum where the united states can present its views. the united nations maintains peacekeeping forces in many parts of the world today. the united nations plays an essential role in providing economic and social assistance.

Explanation:

Opponents of U.S. membership in the United Nations might argue that it is expensive and has failed to prevent international aggression, as this highlights perceived negative aspects of the organization. The other options emphasize positive - roles of the UN.

Answer:

The United Nations is expensive and has failed to prevent international aggression.