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In 1919, the Treaty of Versailles was able to create the League of Nations at the same time. Eventually, the League of Nations desintagrated due to their lack of strength during WW1.
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While WW2 was still in course, 26 nations met to promise to continue fighting the Axis powers (Japan, Germany, and Italy). During this reunion, Franklin D. Roosevelt contributed with the name "United Nations" which had its first use in the "Declaration by United Nations".
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In 1944, the UK, USA, China, and Soviet Union wrote the UN Charter in Dumbarton Oaks, USA.
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50 countries met in San Francisco in the "United Nations Conference on International Organization" with the purpose to create the charter of the United Nations which would set out the rules for the function of the United Nations.
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The United Nations creates the International Court of Justice so only countries can bring cases, and must agree with the courts decition once the decition is made.
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In 1991, the United Nations would hold a conference that would strengthen international cooperation towards ending illegal trade of small arms. Thanks to this, millions of children deaths were erradicated.
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In 2006, the United Nations replaced the Human Rights Commission with the Human Rights Council, which has a higher power since it's directly connected to the General Assembly (the main body in the UN).
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By 2008, the United Nations had an official of 192 member countries, which have never left the UN (Except Indonesia in 1965, for a short period).