During which event was the United Nations established?

The United Nations was established during World War II, specifically in 1945, as a response to the widespread destruction and atrocities that occurred during the war. The founding of the United Nations aimed to promote international cooperation, prevent future conflicts, and maintain peace and security in the world. It arose from the desire to create a platform where countries could come together to discuss their differences and collaborate on global challenges, ultimately working toward a more peaceful international community.

The other historical events listed do not align with the establishment of the UN. For instance, World War I occurred from 1914 to 1918, long before the UN was formed. The Cold War began after World War II and was characterized by political tension but did not play a direct role in the UN's founding. The Great Depression, which took place in the 1930s, was an economic crisis that also preceded the UN's creation. Thus, World War II is the correct context in which the United Nations was established as a proactive measure to foster global diplomacy and peace.