History of South America

After World War 2 the US wanted to cooperate with other nations prevent another world war what concept best represents this attitude?

The concept that best represents the attitude of the United States after World War 2 to cooperate with other nations to prevent another world war is collective security.

Collective security is the idea that all countries should work together to maintain peace and security, rather than relying on their own military strength or forming alliances with other countries. This concept was embodied by the United Nations which was established in 1945.