Which of the following is a characteristic of the UN's formation?

The United Nations was established in 1945 after World War II with the primary purpose of promoting international peace, security, and cooperation among countries. The organization aimed to prevent future conflicts through collective security and diplomacy. This foundational characteristic is reflected in its charter, which emphasizes the importance of resolving disputes peacefully and fostering friendly relations among nations.

The other statements do not accurately represent the formation of the UN. It was not created in 1940, nor was it limited to military leaders or confined to Eastern countries. Instead, it includes a diverse membership of states from around the globe, representing a wide array of political, social, and economic systems. This diversity is essential to its role in fostering dialogue and cooperation among different nations.