| Timeline |
|---|
| 25 Jan 1919 CE | Versailles peace conference accepts the principle of a League of Nations. The first meeting was one year later. | |
| 14 Feb 1919 CE | Draft covenant of League of Nations completed. | |
| 28 Jun 1919 CE | The Treaty of Versailles, ending WWI, is signed. | |
| 1919 CE | US Senate rejects (55-39) the Treaty of Versailles and the League of Nations. | |
| 1920 CE | British Empire receives League of Nations mandate to Nauru. | |
| 1920 CE | Denmark and Cuba join the League of Nations. | |
| 1920 CE | Japan receives League of Nations mandate over the Pacific islands. | |
| 1920 CE | The League of Nations' first meeting in Geneva. The Treaty of Versailles is in effect. | |
| 1920 CE | League of Nations recognizes perpetual neutrality of Switzerland. | |
| 1920 CE | The Netherlands joins League of Nations. | |
| 1920 CE | Saarland is administrated by the League of Nations. | |
| 1920 CE | South Africa receives League of Nations mandate over South West Africa. | |
| 1920 CE | Switzerland rejoins the League of Nations. | |
| 1920 CE | US Senate rejects Treaty of Versailles for the second time refusing to ratify League of Nations' covenant (maintaining its isolation policy). | |
| 26 Jun 1945 CE | UN Charter signed by 50 nations in San Francisco. | |
| 24 Oct 1945 CE | United Nations Charter becomes effective amongst the original 51 nations: Argentina, Australia, Belgium, Bolivia, Brazil, Belarus, Canada, Chile, China, Colombia, Costa Rica, Cuba, Czechoslovakia, Denmark, Dominican Republic, Ecuador, Egypt, El Salvador, Ethiopia, France, Greece, Guatemala, Haiti, Honduras, India, Iran, Iraq, Lebanon, Liberia, Luxembourg, Mexico, Netherlands, New Zealand, Nicaragua, Norway, Panama, Paraguay, Peru, Philippines, Poland, Russian Federation, Saudi Arabia, South Africa, Syrian Arab Republic, Turkey, Ukraine, United Kingdom of Great Britain and Northern Ireland, United States of America, Uruguay, Venezuela & Yugoslavia. | |
| 1945 CE | France joins the UN. | |
| 1945 CE | Poland signs the UN charter | |
| 10 Jan 1946 CE | UN General Assembly 1st session convenes with 51 nations in London | |
| 17 Jan 1946 CE | United Nations Security Council holds its 1st meeting in London. | |
| 1 Feb 1946 CE | Trygve Lie, a Norwegian socialist, becomes 1st Secretary-General of UN. | |
| 1946 CE | League of Nations assembles for last time | |
| 1946 CE | League of Nations dissolves (3 months after the UN starts) | |
| 1946 CE | UN accepts 6 Manhattan blocks as a gift from John D Rockefeller Jr | |
| 1946 CE | UN Children's Fund (UNICEF) established (Nobel 1965) | |
| 1946 CE | UN Educational, Scientific, & Cultural Organization formed | |
| 1946 CE | UN General Assembly 2nd session convenes (1st NYC) (Flushing Meadows) | |
| 1946 CE | UN General Assembly votes to establish UN HQs in NYC | |
| 1946 CE | UN set up temporary HQ at Hunter (now Lehman) College (Bronx) | |
| 1946 CE | Afghanistan, Iceland, Sweden & Thailand joined the UN (now 55 members). | |
| 1947 CE | UN Gen Assembly partitions Palestine between Arabs & Jews | |
| 1947 CE | UN General assembly begins debate on printing their own stamps | |
| 1947 CE | UN trusteeship for Nauru granted to Australia, New Zealand & the UK. | |
| 1947 CE | Pakistan & Yemen joined the UN (now 57 members). | |
| 10 Dec 1948 CE | UN General Assembly adopts Universal Declaration of Human Rights. | |
| 1948 CE | UN General Assembly unanimously approves Convention on Genocide | |
| 1948 CE | Myanmar joined the UN (now 58 members). | |
| 1948 CE | The World Health Organisation is formed by the UN. | |
| 1949 CE | UN Security council condemns Dutch aggression in Indonesia | |
| 1949 CE | Israel joined the UN (now 59 members) by a vote of 37-12. | |
| 1950 CE | UN gets US government approval to issue postage stamps. | |
| 1950 CE | UN World Meteorological Organization established. | |
| 1950 CE | Indonesia joined the UN (now 60 members). | |
| 1951 CE | United Kingdom of Libya gains independence from Italy via the UN. | |
| 1952 CE | UN turns over Eritrea to Ethiopia. | |
| 1955 CE | Albania, Austria, Bulgaria, Cambodia, Finland, Hungary, Ireland, Italy, Jordan, Lao People's Democratic Republic, Libyan Arab Jamahiriya, Nepal, Portugal, Romania, Spain & Sri Lanka joined the UN (now 76 members). | |
| 1956 CE | Japan, Morocco, Sudan & Tunisia joined the UN (now 80 members). | |
| 1957 CE | Ghana & Malaysia joined the UN (now 82 members). | |
| 21 Jan 1958 CE | Syria and Egypt merged their membership and became a single member of the UN (United Arab Republic) (now 81 members). | |
| 1958 CE | Guinea joined the UN (now 82 members). | |
| 1960 CE | Internationl Development Association, a UN agency, comes into existence. | |
| 1960 CE | Nikita Khrushchev pounds his shoe at UN General Assembly session | |
| 1960 CE | Benin, Burkina Faso, Cameroon, Central African Republic, Chad, Congo, Côte d'Ivoire (Ivory Coast), Cyprus, Gabon, Madagascar, Mali, Niger, Nigeria, Senegal, Somalia, Togo & the Democratic Republic of the Congo joined the UN (now 99 members). | |
| 1961 CE | Outer Mongolia & Mauritania become the 102nd & 103rd members of the UN. | |
| 1961 CE | Sierre Leone becomes the 100th member of the UN. | |
| 1961 CE | Tanganyika becomes the 104th member of the UN. | |
| 1961 CE | UN genocide pact goes into effect. | |
| 1961 CE | Mauritania, Mongolia, Sierra Leone & the United Republic of Tanzania joined the UN (now 104 members). | |
| 1962 CE | 110th member of the UN admitted (Uganda). | |
| 1962 CE | Rwanda, Burundi, Jamaica & Trinidad admitted (105th-108th) to the UN. | |
| 1962 CE | U Thant of Burma elected 3rd Secretary-General of UN unanimously. | |
| 1962 CE | UN announces Earth population has hit 3 billion. | |
| 1962 CE | UN General Assembly censures Portugal (because of Angola). | |
| 1962 CE | Algeria, Burundi, Jamaica, Rwanda, Trinidad and Tobago & Uganda joined the UN (now 110 members). | |
| 1963 CE | Kenya & Kuwait joined the UN (now 112 members). | |
| 1964 CE | Malawi, Malta & Zambia joined the UN (now 115 members). | |
| 1965 CE | Gambia, Maldives & Singapore joined the UN (now 118 members). | |
| 1966 CE | Barbados, Botswana, Guyana & Lesotho joined the UN (now 122 members). | |
| 1967 CE | Democratic Yemen joined the UN (now 123 members). | |
| 1968 CE | Equatorial Guinea, Mauritius & Swaziland joined the UN (now 126 members). | |
| 1970 CE | Fiji joined the UN (now 127 members). | |
| 1971 CE | Bahrain, Bhutan, Oman, Qatar, United Arab Emirates joined the UN (now 132 members). | |
| 18 Sep 1973 CE | German Democratic Republic & the Federal Republic of Germany joined the UN (now 135 members). | |
| 1973 CE | Bahamas joined the UN (now 133 members). | |
| 1974 CE | Bangladesh, Grenada & Guinea-Bissau joined the UN (now 138 members). | |
| 1975 CE | Cape Verde, Comoros, Mozambique, Papua New Guinea, Sao Tome and Principe & Suriname joined the UN (now 144 members). | |
| 1976 CE | Angola, Samoa & Seychelles joined the UN (now 147 members). | |
| 1977 CE | Djibouti & Viet Nam joined the UN (now 149 members). | |
| 1978 CE | Dominica & Solomon Islands joined the UN (now 151 members). | |
| 1979 CE | Saint Lucia joined the UN (now 152 members). | |
Has external links specifically assocated with this event.