What major international organization was formed after World War I, aiming to maintain peace?

The League of Nations was established after World War I in 1920, primarily aimed at preventing future conflicts and promoting peace through collective security and diplomacy. The organization was created as part of the Treaty of Versailles, which officially ended the war. The League sought to provide a platform for resolving international disputes and aimed to promote cooperation between countries to avoid the tragedies associated with global warfare.

Although the League of Nations was the first international organization with the specific goal of maintaining world peace, it ultimately struggled with enforcement and authority, which led to its ineffectiveness in preventing future conflicts, including World War II. Following that war, the United Nations was formed, incorporating lessons learned from the League and aiming for broader international cooperation and peacekeeping.

The other responses refer to organizations that were created under different contexts and for different purposes. NATO was established in 1949 as a military alliance during the Cold War, while the European Union focuses on economic and political integration among European countries. The United Nations, formed in 1945, serves a similar purpose to the League of Nations but was designed to be more effective in promoting international cooperation and maintaining peace after the failures of the League.