The United Nations is an intergovernmental organization founded on 24 October 1945 after the end of World War II with the goal of promoting international cooperation to prevent another world war. In 2015 it had 193 member states, and it united many countries under it. The UN had various purposes, ranging from peacekeeping and relief duties to preserving cultural sites and cultures.
The United Nations was founded on 24 October 1945 after the San Francisco Conference under President Harry Truman of the United States, with the UN Charter being passed that day. The UN consisted of 51 people at its start, but it grew as dozens of countries won their independence in the period of decolonization following World War II's end. It was a way to mediate between the Western Allies (the USA, United Kingdom, France, et. al.) and Comintern (the Soviet Union, China, and North Korea), and the United Nations sought to prevent another world war from occurring. A world war was at risk in 1950-1953 when North Korea invaded the capitalist South Korea, leading to the UN assembling a coalition to restore the status quo; China fought in the war, and it was eventually resolved with the Treaty of Panmunjom in 1953, declaring a ceasefire that ended the bloody and pointless war. During further conflicts in the Cold War, countries could send representatives to appeal to the Security Council or other chambers of the UN, and they held meetings to discuss various issues, ranging from wars and crises to the preservation of cultural sites and economic issues. The UN became a way for all countries in the world to have a voice in the same room, and the UN allowed for the world to be temporarily united. However, the UN could not prevent all wars from happening, and they were forced to send peacekeepers to some areas to keep two hostile sides apart or - in extreme cases - to fight an enemy.