The establishment of the United Nations (UN) in the aftermath of World War II was a response to the devastation and atrocities of the war. Founded in 1945, the UN aimed to promote international cooperation, prevent future conflicts, and uphold human rights. The UN Charter emphasized the importance of diplomacy, peacekeeping, and collective security, reflecting the lessons learned from the failures of the League of Nations. The organization has since played a critical role in mediating disputes, providing humanitarian assistance, and addressing global challenges such as poverty, health, and climate change, shaping international relations in the modern world.