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The story
Founded by Argentina, Australia, Belgium, Bolivia, Brazil, Byelorussian Soviet Socialist Republic, Canada, Chile, 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, Republic of China, Saudi Arabia, South Africa, Soviet Union, Syria, Turkey, Ukrainian Soviet Socialist Republic, United Kingdom, United States, Uruguay, Venezuela and Yugoslavia on Oct 24, 1945.1
Background (pre-1941)
In the century prior to the UN's creation, several international organizations such as the International Committee of the Red Cross (ICRC) were formed to ensure protection and assistance for victims of armed conflict and strife.
During World War I, several major leaders, especially then-U.S. President Woodrow Wilson, advocated for a world body to guarantee peace. The winners of the war, the Allied Powers, met to decide on formal peace terms at the Paris Peace Conference. The League of Nations was approved and started operations, but the United States never joined. On 10 January 1920, the League of Nations formally came into being when the Covenant of the League of Nations, ratified by 42 nations in 1919, took effect. The League of Nations Council acted as an executive body directing the Assembly's business; though with few powers explicitly vested in either body, the League's operation was mostly derived from informal convention rather than the Covenant itself. With few exceptions, all of the League's substantive decisions required unanimity, a provision negotiated in the name of upholding national sovereignty. It began with four permanent members of the Council—the United Kingdom, France, Italy and Japan. The fifth permanent seat on the Council, meant to be held by the United States, was later given to Germany and, after its withdrawal, the Soviet Union. Forty nations voted for Japan to end its occupation of Manchuria but Japan voted against it and withdrew from the League instead. It also failed to act against the Second Italo-Ethiopian War, after the appeal for international intervention by Ethiopian Emperor Haile Selassie I at Geneva in 1936 went with no avail, including when calls for economic sanctions against Italy failed. Italy and other nations left the League.
When World War II broke out in 1939, the League effectively closed down. Among its final acts was the expulsion of the Soviet Union for the invasion of Finland.
Declarations by the Allies of World War II (1941–1944)
The first step towards the establishment of the United Nations was the Inter-Allied Conference in London that led to the Declaration of St James's Palace on 12 June 1941. By August 1941, American president Franklin D. Roosevelt and British prime minister Winston Churchill had drafted the Atlantic Charter; which defined goals for the post-war world. At the subsequent meeting of the Inter-Allied Council in London on 24 September 1941, the eight governments in exile of countries under Axis occupation, together with the Soviet Union and representatives of the Free French Forces, unanimously adopted adherence to the common principles of policy set forth by Britain and the United States.
Roosevelt and Churchill met at the White House in December 1941 for the Arcadia Conference. Roosevelt is considered a founder of the UN, and coined the term United Nations to describe the Allied countries. Churchill accepted it, noting its use by Lord Byron. The text of the Declaration by United Nations was drafted on 29 December 1941, by Roosevelt, Churchill, and Harry Hopkins. It incorporated Soviet suggestions but included no role for France. One major change from the Atlantic Charter was the addition of a provision for religious freedom, which Stalin approved after Roosevelt insisted.
Roosevelt's idea of the "Four Powers" refers to the four major Allied countries, the United States, the United Kingdom, the Soviet Union, and China, emerged in the Declaration by the United Nations. On New Year's Day 1942, Roosevelt, Churchill, the Soviet Union's former Foreign Minister Maxim Litvinov, and the Chinese Premier T. V. Soong signed the "Declaration by United Nations", and the next day the representatives of twenty-two other nations added their signatures. During the war, the United Nations became the official term for the Allies. In order to join, countries had to sign the Declaration and declare war on the Axis powers.
The October 1943 Moscow Conference resulted in the Moscow Declarations, including the Four Power Declaration on General Security. This declaration was signed by the Allied Big Four—the United States, the Soviet Union, the United Kingdom, and China—and aimed for the creation "at the earliest possible date of a general international organization". This was the first public announcement that a new international organization was being contemplated to replace the League of Nations. The Tehran Conference followed shortly afterwards at which Roosevelt, Churchill and Joseph Stalin, the leader of the Soviet Union, met and discussed the idea of a post-war international organization.
The new international organization was formulated and negotiated amongst the delegations from the Allied Big Four at the Dumbarton Oaks Conference from 21 September to 7 October 1944. They agreed on proposals for the aims, structure and functioning of the new organization. It took the conference at Yalta in February 1945, and further negotiations with the Soviet Union, before all the issues were resolved.
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Founding (1945)
By 1 March 1945, 21 additional states had signed the Declaration by the United Nations. After months of planning, the UN Conference on International Organization opened in San Francisco on 25 April 1945. It was attended by 50 nations' governments and a number of non-governmental organizations. The delegations of the Big Four chaired the plenary meetings. Previously, Churchill had urged Roosevelt to restore France to its status of a major power after the liberation of Paris in August 1944. The drafting of the Charter of the United Nations was completed over the following two months, and it was signed on 26 June 1945 by the representatives of the 50 countries. The UN officially came into existence at 20:07 (UTC) on 24 October 1945, upon ratification of the Charter by the five permanent members of the Security Council: the United States, the United Kingdom, France, the Soviet Union and China — and by a majority of the other 46 nations.
The first meetings of the General Assembly, with 51 nations represented, and the Security Council took place in London beginning in January 1946. Debates began at once, covering topical issues such as the presence of Soviet troops in Iranian Azerbaijan and British forces in Greece. British diplomat Gladwyn Jebb served as interim secretary-general.
The General Assembly selected New York City as the site for the headquarters of the UN. Construction began on 14 September 1948 and the facility was completed on 9 October 1952. The Norwegian Foreign Minister, Trygve Lie, was the first elected UN secretary-general.
Cold War (1947–1991)
Though the UN's primary mandate was peacekeeping, the division between the United States and the Soviet Union often paralysed the organization; this generally allowed it to intervene only in conflicts distant from the Cold War. Two notable exceptions were a Security Council resolution on 7 July 1950 authorizing a US-led coalition to repel the North Korean invasion of South Korea, passed in the absence of the Soviet Union, and the signing of the Korean Armistice Agreement on 27 July 1953.
On 29 November 1947, the General Assembly approved Resolution 181, a proposal to partition British Mandatory Palestine into two states, a Jewish state and an Arab state, with Jerusalem placed under international status. The Partition plan passed 33–13 with 10 abstentions and one absent. The plan was accepted by the Jews and rejected by the Arabs of Palestine and the Arab states leading to civil war. Following the declaration of the State of Israel on 15 May 1948, the surrounding Arab armies invaded Palestine, beginning the 1948 Arab–Israeli War. Two years later, Ralph Bunche, a UN official, negotiated an armistice to the resulting conflict, with the Security Council deciding that "an armistice shall be established in all sectors of Palestine." On 7 November 1956, the first UN peacekeeping force was established to end the Suez Crisis; however, the UN was unable to intervene against the Soviet Union's simultaneous invasion of Hungary, following the country's revolution.
On 14 July 1960, the UN established the United Nations Operation in the Congo (UNOC), the largest military force of its early decades, to bring order to Katanga, restoring it to the control of the Democratic Republic of the Congo by 11 May 1964. While travelling to meet rebel leader Moise Tshombe during the conflict, Dag Hammarskjöld, often named as one of the UN's most effective secretaries-general, died in a plane crash. Months later he was posthumously awarded the Nobel Peace Prize. In 1964, Hammarskjöld's successor, U Thant, deployed the UN Peacekeeping Force in Cyprus, which would become one of the UN's longest-running peacekeeping missions.
With the spread of decolonization in the 1960s, the UN's membership shot up due to an influx of newly independent nations. In 1960 alone, 17 new states joined the UN, 16 of them from Africa. On 25 October 1971, with opposition from the United States, but with the support of many Third World nations, the People's Republic of China was given the Chinese seat on the Security Council in place of the Republic of China (also known as Taiwan). The vote was widely seen as a sign of waning American influence in the organization. Third World nations organized themselves into the Group of 77 under the leadership of Algeria, which briefly became a dominant power at the UN. On 10 November 1975, a bloc comprising the Soviet Union and Third World nations passed a resolution, over strenuous American and Israeli opposition, declaring Zionism to be a form of racism. The resolution was repealed on 16 December 1991, shortly after the end of the Cold War.
With an increasing Third World presence and the failure of UN mediation in conflicts in the Middle East, Vietnam, and Kashmir, the UN increasingly shifted its attention to its secondary goals of economic development and cultural exchange.
After the Cold War (1991–1999)
After the Cold War, the UN saw a radical expansion in its peacekeeping duties, taking on more missions in five years than it had in the previous four decades. Between 1988 and 2000, the number of adopted Security Council resolutions more than doubled, and the peacekeeping budget increased more than tenfold. The UN negotiated an end to the Salvadoran Civil War, launched a successful peacekeeping mission in Namibia, and oversaw democratic elections in post-apartheid South Africa and post-Khmer Rouge Cambodia. In 1991, the UN authorized a US-led coalition that repulsed Iraq's invasion of Kuwait. Brian Urquhart, the under-secretary-general of the UN from 1971 to 1985, later described the hopes raised by these successes as a "false renaissance" for the organization, given the more troubled missions that followed.
Beginning in the last decades of the Cold War, critics of the UN condemned the organization for perceived mismanagement and corruption. In 1984, American president Ronald Reagan withdrew the United States' funding from the United Nations Educational, Scientific and Cultural Organization (or UNESCO) over allegations of mismanagement, followed by the United Kingdom and Singapore. Boutros Boutros-Ghali, the secretary-general from 1992 to 1996, initiated a reform of the Secretariat, somewhat reducing the size of the organization. His successor, Kofi Annan, initiated further management reforms in the face of threats from the US to withhold its UN dues.
Though the UN Charter had been written primarily to prevent aggression by one nation against another, in the early 1990s the UN faced several simultaneous, serious crises within Somalia, Haiti, Mozambique, and the nations that previously made up Yugoslavia. The UN mission in Somalia was widely viewed as a failure after the United States' withdrawal following casualties in the Battle of Mogadishu. The UN mission to Bosnia faced worldwide ridicule for its indecisive and confused mission in the face of ethnic cleansing. In 1994, the UN Assistance Mission for Rwanda failed to intervene in the Rwandan genocide amidst indecision in the Security Council.
From the late 1990s to the early 2000s, international interventions authorized by the UN took a wider variety of forms. The United Nations Security Council Resolution 1244 authorized the NATO-led Kosovo Force beginning in 1999. The UN mission in the Sierra Leone Civil War was supplemented by a British military intervention. The invasion of Afghanistan in 2001 was overseen by NATO. In 2003, the United States invaded Iraq despite failing to pass a UN Security Council resolution for authorization, prompting a new round of questioning of the UN's effectiveness.
Under the eighth secretary-general, Ban Ki-moon, the UN intervened with peacekeepers in crises such as the War in Darfur in Sudan and the Kivu conflict in the Democratic Republic of the Congo and sent observers and chemical weapons inspectors to the Syrian Civil War. In 2013, an internal review of UN actions in the final battles of the Sri Lankan Civil War in 2009 concluded that the organization had suffered a "systemic failure." In 2010, the organization suffered the worst loss of life in its history, when 101 personnel died in the Haiti earthquake. Acting under the United Nations Security Council Resolution 1973 in 2011, NATO countries intervened in the First Libyan Civil War.
The Millennium Summit was held in 2000 to discuss the UN's role in the 21st century. The three-day meeting was the largest gathering of world leaders in history, and it culminated in the adoption by all member states of the Millennium Development Goals (MDGs), a commitment to achieve international development in areas such as poverty reduction, gender equality and public health. Progress towards these goals, which were to be met by 2015, was ultimately uneven. The 2005 World Summit reaffirmed the UN's focus on promoting development, peacekeeping, human rights and global security. The Sustainable Development Goals (SDGs) were launched in 2015 to succeed the Millennium Development Goals.
In addition to addressing global challenges, the UN has sought to improve its accountability and democratic legitimacy by engaging more with civil society and fostering a global constituency. In an effort to enhance transparency, in 2016 the organization held its first public debate between candidates for secretary-general. On 1 January 2017, Portuguese diplomat António Guterres, who had previously served as the UN High Commissioner for Refugees, became the ninth secretary-general. Guterres has highlighted several key goals for his administration, including an emphasis on diplomacy for preventing conflicts, more effective peacekeeping efforts, and streamlining the organization to be more responsive and versatile to international needs.
On 13 June 2019, the UN signed a Strategic Partnership Framework with the World Economic Forum in order to "jointly accelerate" the implementation of the 2030 Agenda for Sustainable Development.
2020s: financial crisis
Throughout most of its history, the UN has faced funding issues. However, they have become severe since 2020, and in 2025, the UN began facing a financial crisis resulting from delays in member state due payments and refusal to pay the amount the UN charges. A major problem is that the United States, the largest contributor, has a law in place since 1994 where it will not pay more than 25% of total UN Peacekeeping fees (although as of 2024 it was paying 27%). Additionally, the US and the second-largest contributor, China, often delay their payments in order to influence the UN on topics such as the Gaza war and Persecution of Uyghurs in China. Other countries began to follow suit, triggering a financial crisis. On 19 May 2025, only 61 countries paid their dues on time and in full. The crisis is causing massive budget cuts within the UN, with the UN warning that millions of lives are being put at risk. In January 2026, Guterres sent a letter to all members about an "imminent financial collapse" of the UN.
From Wikipedia’s article on United Nations, shared under CC BY-SA 4.0.5