What organization was formed in 1945 to promote international peace and security?

The organization that was formed in 1945 to promote international peace and security is the United Nations (U.N.). Following the devastation of World War II, there was a strong international desire to prevent future conflicts and to foster collaboration among nations. The U.N. was established to encourage diplomacy, provide a platform for dialogue, and address global issues, including human rights, development, and humanitarian assistance.

The U.N. operates through various agencies and programs, facilitating cooperation in various areas such as health, education, and environmental protection. Its charter emphasizes the importance of collective security, and it plays a critical role in conflict resolution and peacekeeping missions around the world.

In contrast, the other organizations listed were created for different purposes and at different points in time. The World Health Organization (WHO) was established in 1948 to focus on global health issues, NATO was formed in 1949 as a military alliance for mutual defense against aggression, and the European Union (EU) was developed in the latter half of the 20th century to promote economic and political integration among European nations. Each of these entities has distinct goals and functions that do not center primarily on the overarching mission of maintaining international peace and security, as the U.N. does.