The United Nations (UN) is an intergovernmental organization founded in 1945 with the mission of maintaining international peace and security, fostering friendly relations between nations, promoting international cooperation, and harmonizing state actions to achieve these aims. Established by the UN Charter signed on June 26, 1945, the UN serves as a central forum for addressing global issues and coordinating efforts among member states.
In 1919, the Covenant of the League of Nations was ratified by 42 nations. This ratification led to the League of Nations formally coming into being on January 10, 1920.
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 Council acted as an executive body directing the Assembly's business and began with four permanent members.
In 1933, the League of Nations proved ineffective as it failed to act against the Japanese invasion of Manchuria. Forty nations voted for Japan to withdraw from Manchuria but Japan voted against it and walked out of the League instead of withdrawing from Manchuria.
In 1936, the League of Nations failed to act against the Second Italo-Ethiopian War, after the appeal for international intervention by Ethiopian Emperor Haile Selassie I at Geneva went with no avail, including when calls for economic sanctions against Italy failed. Italy and other nations left the League.
In 1939, with the outbreak of World War II, the League of Nations effectively closed down, marking the end of its operations.
In June 1941, the Inter-Allied Conference in London led to the Declaration of St James's Palace, marking the first step towards the establishment of the United Nations.
In August 1941, American president Franklin Roosevelt and British prime minister Winston Churchill drafted the Atlantic Charter, which defined goals for the post-war world.
In September 1941, at the Inter-Allied Council meeting in London, eight governments in exile, the Soviet Union, and representatives of the Free French Forces unanimously adopted adherence to the principles of policy set forth by Britain and the United States in the Atlantic Charter.
In December 1941, Roosevelt and Churchill met at the White House for the Arcadia Conference. The text of the Declaration by United Nations was drafted by Roosevelt, Churchill, and Harry Hopkins, incorporating Soviet suggestions and including a provision for religious freedom.
In 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", with twenty-two other nations adding their signatures the next day. The United Nations became the official term for the Allies.
In October 1943, the Moscow Conference resulted in the Moscow Declarations, including the Four Power Declaration on General Security. The declaration was signed by the Allied Big Four and aimed for the creation "at the earliest possible date of a general international organization", the first public announcement of a new international organization to replace the League of Nations.
From 21 September to 7 October 1944, the Allied Big Four met at the Dumbarton Oaks Conference to formulate and negotiate the new international organization. They agreed on proposals for the aims, structure and functioning of the new organization.
In February 1945, the conference at Yalta, along with further negotiations with the Soviet Union, led to the resolution of all outstanding issues related to the formation of the new international organization.
By 1 March 1945, 21 additional states had signed the Declaration by the United Nations, signaling increased international support for the new organization.
On 25 April 1945, the UN Conference on International Organization opened in San Francisco, attended by 50 nations' governments and a number of non-governmental organizations, with the Big Four chairing the plenary meetings.
In June 1945, the UN Charter was signed, establishing the United Nations with the mission of maintaining international peace and security, developing friendly relations among states, promoting international cooperation, and serving as a center for harmonizing the actions of states.
On 26 June 1945, the representatives of 50 countries signed the Charter of the United Nations, completing the drafting process that spanned over two months.
On 24 October 1945, the UN officially came into existence upon ratification of the Charter by the five permanent members of the Security Council and by a majority of the other 46 nations.
In 1945, the regulation of armaments was included in the writing of the UN Charter as a way of limiting the use of human and economic resources for their creation.
In January 1946, the first meetings of the General Assembly, with 51 nations represented, and the Security Council took place in London, addressing topical issues such as the presence of Russian troops in Iranian Azerbaijan and British forces in Greece. Gladwyn Jebb served as interim secretary-general.
On January 10, 1946, the first session of the General Assembly convened in London with representatives of 51 nations.
In 1946, the United Nations Children's Fund (UNICEF) was created to aid European children after the Second World War. Its mission expanded to provide aid around the world and to uphold the convention on the Rights of the Child.
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 plan was accepted by the Jews and rejected by the Arabs of Palestine and the Arab states.
Since 1947, the UN has carried out 71 peacekeeping operations.
On 14 September 1948, construction began on the headquarters of the UN in New York City. The Norwegian Foreign Minister, Trygve Lie, was the first elected UN secretary-general.
In 1948, the General Assembly adopted the Universal Declaration of Human Rights, drafted by Eleanor Roosevelt and René Cassin, proclaiming basic civil, political, and economic rights. The document serves as a standard for all nations and people and led to the creation of the International Covenant on Civil and Political Rights, as well as the International Covenant on Economic, Social and Cultural Rights.
Since 1948, UN peacekeepers with the United Nations Truce Supervision Organization (UNTSO) have been stationed in the Middle East, making it the longest-running active peacekeeping mission.
Following the Chinese Civil War, the People's Republic of China (PRC) was founded on October 1, 1949, while the government of the Republic of China (ROC) retreated to Taiwan, continuing to claim it was the sole government of China.
On 7 July 1950, the Security Council passed a resolution authorizing a US-led coalition to repel the North Korean invasion of South Korea, passed in the absence of the Soviet Union.
In 1950, the Soviet Union boycotted the United Nations in protest to China's seat at the UN Security Council being given to the anti-communist Republic of China.
On 9 October 1952, the construction of the UN headquarters in New York City was completed, marking a significant milestone in the organization's history.
On 27 July 1953, the Korean Armistice Agreement was signed, marking the end of major hostilities in the Korean War.
In his 1953 address to the United States Committee for United Nations Day, American President Dwight D. Eisenhower expressed his view that the United Nations represents man's best organized hope to substitute the conference table for the battlefield.
The UN High Commissioner for Refugees was awarded the Nobel Peace Prize in 1954 in recognition of their work.
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.
In 1957, Lester B. Pearson, the Canadian Secretary of State for External Affairs, was awarded the Nobel Peace Prize for his role in organizing the UN's first peacekeeping force to resolve the Suez Crisis.
On 14 July 1960, the UN established the United Nations Operation in the Congo (or UNOC), the largest military force of its early decades, to bring order to Katanga.
In 1960 alone, 17 new states joined the UN, 16 of them from Africa, marking a significant increase in membership due to decolonization.
In 1960, the General Assembly adopted the Declaration on the Granting of Independence to Colonial Countries and Peoples with no votes against, which worked towards decolonization through groups including the UN Committee on Decolonization.
By 11 May 1964, the United Nations Operation in the Congo restored Katanga to the control of the Democratic Republic of the Congo
On June 15, 1964, the Group of 77 (G77) was founded by the "Joint Declaration of the Seventy-Seven Countries" at the United Nations Conference on Trade and Development (UNCTAD).
In 1965, Indonesia withdrew its membership from the United Nations in protest to the election of Malaysia as a non-permanent member of the Security Council.
UNICEF won the Nobel Peace Prize in 1965 in recognition of their work.
In 1966, Indonesia resumed its membership in the United Nations after withdrawing in 1965.
In 1967, the Group of 77 held its first major meeting in Algiers, adopting the Charter of Algiers and establishing permanent institutional structures.
The International Labour Organization won the Nobel Peace Prize in 1969 in recognition of their work.
In October 1971, on the occasion of its 26th anniversary, a Hymn to the United Nations, with lyrics by W. H. Auden, was performed by Pau Casals at the request of then United Nations Secretary-General U Thant, on 24 October 1971.
In 1971, Brian Urquhart became the under-secretary-general of the UN.
In 1971, disagreements in the Security Council about military action are seen as having failed to prevent the Bangladesh genocide.
In 1971, the General Assembly passed a resolution recognizing the PRC as "the only legitimate representatives of China to the United Nations."
In 1972, the UN made environmental issues a prominent part of its agenda by forming the UN Environmental Programme (UNEP).
On 10 November 1975, a bloc comprising the Soviet Union and Third World nations passed a resolution declaring Zionism to be a form of racism.
In 1976, the General Assembly established the Joint Inspection Unit to identify inefficiencies within the UN system.
In 1979, the General Assembly adopted the Convention on the Elimination of All Forms of Discrimination against Women, marking a significant step towards gender equality and women's rights.
In 1980, the World Health Organization (WHO) announced that the eradication of smallpox had been completed, marking a significant achievement in global health.
The UN High Commissioner for Refugees was awarded the Nobel Peace Prize again in 1981, making them one of two recipients to win the prize twice.
In 1984, American president Ronald Reagan withdrew the United States' funding from the United Nations Educational, Scientific and Cultural Organization (UNESCO) over allegations of mismanagement, followed by the United Kingdom and Singapore.
In 1985, Brian Urquhart term ends as under-secretary-general of the UN.
Between 1988 and 2000, the number of adopted Security Council resolutions more than doubled, highlighting the UN's increased involvement in peacekeeping.
In 1988, the Nobel Peace Prize was awarded to the UN Peacekeeping Forces.
In 1988, the Somali Civil War began, marking a period during which Mohamed Sahnoun later claimed the UN missed opportunities to prevent major human tragedies.
In 1988, the UNEP and the World Meteorological Organization (WMO) established the Intergovernmental Panel on Climate Change, which assesses and reports on research on global warming.
The UN Peacekeeping Forces won the Nobel Peace Prize in 1988 in recognition of their work.
In 1989, the General Assembly adopted the Convention on the Rights of the Child, which outlines the basic human rights to which children everywhere are entitled.
In January 1991, the Siad Barre regime fell in Somalia. Mohamed Sahnoun later claimed the UN missed opportunities between 1988 and January 1991 to prevent major human tragedies during this period.
On 16 December 1991, shortly after the end of the Cold War, the resolution declaring Zionism as a form of racism was repealed.
In 1991, the UN authorized a US-led coalition that repulsed Iraq's invasion of Kuwait, showcasing the UN's role in addressing international aggression.
From 1992 to 1996, Boutros Boutros-Ghali, the secretary-general, initiated a reform of the Secretariat, somewhat reducing the size of the organization.
In 1992, the Earth Summit was held in Rio de Janeiro, Brazil, which sought to give new impetus to UN efforts in the area of environmental issues.
In 1992, the United Nations intervened in Somalia, but the intervention was considered a failure, as analyzed later in Mohamed Sahnoun's book "Somalia: The Missed Opportunities".
In 1993, the United Nations Commission on Human Rights was formed to oversee human rights issues for the UN, following the recommendation of that year's World Conference on Human Rights.
On November 1, 1994, the Trusteeship Council suspended its operations upon the independence of Palau, the last remaining UN trustee territory.
In 1994, Mohamed Sahnoun, former special representative of the secretary-general of the UN to Somalia, published "Somalia: The Missed Opportunities", a book analyzing the failure of the 1992 UN intervention in Somalia.
In 1994, disagreements in the Security Council about military action are seen as having failed to prevent the Rwandan genocide.
In 1994, the Office of Internal Oversight Services (OIOS) was established by the General Assembly to serve as an efficiency watchdog within the UN.
In 1994, the UN Assistance Mission for Rwanda failed to intervene in the Rwandan genocide amidst indecision in the Security Council, marking a significant failure in the organization's peacekeeping efforts.
Since 1994, the United States has had a law in place where it will not pay more than 25% of total UN Peacekeeping fees.
From 1992 to 1996, Boutros Boutros-Ghali was the secretary-general.
In 1997, an amendment containing the American Sovereignty Restoration Act received a floor vote in the United States Congress, with 54 representatives voting in favor of the bill.
In December 2000, the Assembly revised the scale of assessments in response to pressure from the United States, reducing the regular budget ceiling from 25% to 22%.
Between 1988 and 2000, the peacekeeping budget increased more than tenfold, reflecting the UN's expanded peacekeeping duties.
In 2000, the 192 UN member states agreed to achieve eight Millennium Development Goals by 2015, aiming to address global issues such as poverty, hunger, and disease.
In 2000, the Millennium Summit was held to discuss the UN's role in the 21st century. The summit resulted in the adoption of the Millennium Development Goals (MDGs).
In 2001, the invasion of Afghanistan was overseen by NATO, indicating a shift in international intervention strategies.
The UN as a whole was awarded the Nobel Peace Prize in 2001, sharing it with Annan.
In 2002, the UN Permanent Forum on Indigenous Issues, one of three bodies with a mandate to oversee issues related to indigenous peoples, held its first session.
In February 2003, American President George W. Bush stated that free nations will not allow the UN to fade into history as an ineffective, irrelevant debating society, referring to UN uncertainty towards Iraqi provocations under the Saddam Hussein regime.
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.
In 2004, the UN faced accusations of widespread corruption, including billions of dollars of kickbacks, within its recently ended Oil-for-Food Programme in Iraq. An independent inquiry found the involvement of UN officials and raised questions about the role of Kojo Annan.
A 2005 study by the RAND Corporation found the UN to be successful in two-thirds of its peacekeeping efforts.
In 2005, the World Summit reaffirmed the UN's focus on promoting development, peacekeeping, human rights, and global security.
The International Atomic Energy Agency won the Nobel Peace Prize in 2005 in recognition of their work.
In 2006, the Human Rights Council, consisting of 47 nations, replaced the United Nations Commission on Human Rights. Also in 2006, the General Assembly passed a Declaration on the Rights of Indigenous People.
In 2007, U.S. Representative Ron Paul authored H.R. 1146, a bill aimed at the United States' withdrawal from the United Nations. The bill sought to repeal laws pertaining to the UN, terminate funding and UN presence on American property, and withdraw diplomatic immunity for UN employees, allowing up to two years for the United States to withdraw.
In 2007, the IPCC received the Nobel Peace Prize "for their efforts to build up and disseminate greater knowledge about man-made climate change, and to lay the foundations for the measures that are needed to counteract such change."
Further studies published between 2008 and 2021 determined UN peacekeeping operations to be more effective at ensuring long-lasting peace and minimizing civilian casualties.
In 2009, the final battles of the Sri Lankan Civil War occurred. An internal review in 2013 concluded that the UN suffered a "systemic failure" during this time.
In 2010, the UN suffered the worst loss of life in its history when 101 personnel died in the Haiti earthquake.
On July 14, 2011, South Sudan joined the United Nations, becoming the 193rd member state.
In 2011, the General Assembly passed its first resolution recognizing the rights of members of the LGBTQ+ community, marking a milestone for LGBTQ+ rights at the UN.
In 2012, then French President François Hollande stated that France trusts the United Nations as the center of global governance.
By November 2013, the Group of 77 (G77) had expanded to 133 member countries.
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".
The UN-supported Organisation for the Prohibition of Chemical Weapons won the Nobel Peace Prize in 2013 in recognition of their work.
In 2015, the Sustainable Development Goals (SDGs) were launched to succeed the Millennium Development Goals.
In 2016, the UN held its first public debate between candidates for secretary-general in an effort to enhance transparency.
On January 1, 2017, António Guterres became the ninth secretary-general of the UN. He emphasized diplomacy, peacekeeping, and organizational streamlining.
In 2017, António Guterres of Portugal replaced Ban Ki-moon as the secretary-general of the United Nations.
On June 13, 2019, the UN signed a Strategic Partnership Framework with the World Economic Forum to jointly accelerate the implementation of the 2030 Agenda for Sustainable Development.
In 2020, former American President Barack Obama, in his memoir A Promised Land noted the limitations of the UN during the Cold War and its continuing struggles to address global problems due to divisions within the Security Council and lack of collective will among member states.
Since 2020, the UN has faced severe funding issues due to delays in member state due payments and refusal to pay the amount the UN charges.
As of April 2021, almost 5,600 non-governmental organizations have consultative status with the Economic and Social Council (ECOSOC).
As of April 2021, over 88,000 peacekeeping personnel from 121 nations have been deployed on UN missions.
Further studies published between 2008 and 2021 determined UN peacekeeping operations to be more effective at ensuring long-lasting peace and minimizing civilian casualties.
In 2021, the minimum amount assessed to any member nation (or "floor" rate) is set at 0.001% of the UN budget ($31,000 for the two-year budget 2021–2022).
The peacekeeping budget for the 2021–2022 fiscal year is $6.38 billion, supporting 66,839 personnel deployed in 12 missions worldwide.
In 2022, H.R.7806, the most recent iteration of the American Sovereignty Restoration Act, was introduced by Mike D. Rogers.
In 2022, including specialized agencies of the UN, the UN System Chief Executives Board for Coordination reports total expenses of $67.4 billion for 43 United Nations entities.
In 2022, the minimum amount assessed to any member nation (or "floor" rate) is set at 0.001% of the UN budget ($31,000 for the two-year budget 2021–2022).
The peacekeeping budget for the 2021–2022 fiscal year is $6.38 billion, supporting 66,839 personnel deployed in 12 missions worldwide.
In 2023, Tennessee enacted legislation to block the implementation of programs "originating in, or traceable to, the United Nations or a subsidiary entity of the United Nations," including Agenda 21 and the 2030 Agenda.
In 2023, the largest contributors to the UN peacekeeping budget for 2023–2024 are: the United States (26.94%), China (18.68%), Japan (8.03%), Germany (6.11%), the United Kingdom (5.35%), France (5.28%), Italy (3.18%), Canada (2.62%), South Korea (2.57%) and Russia (2.28%).
Starting in 2023, the United Nations Office for Digital and Emerging Technologies has organized an annual UN Open Source Week to facilitate collaborative and international technological projects, AI policies, and governance.
As of 2024 the US was paying 27% of UN peacekeeping fees.
In 2024, the UN budget was $3.59 billion, not including additional resources donated by members, such as peacekeeping forces.
In 2024, the largest contributors to the UN peacekeeping budget for 2023–2024 are: the United States (26.94%), China (18.68%), Japan (8.03%), Germany (6.11%), the United Kingdom (5.35%), France (5.28%), Italy (3.18%), Canada (2.62%), South Korea (2.57%) and Russia (2.28%).
On March 21, 2025, the joint Universities of Leuven and Louvain (Belgium) awarded the UN an honorary degree, which was given to António Guterres.
On 19 May 2025, only 61 countries paid their dues to the UN on time and in full, exacerbating the ongoing financial crisis.
In January 2026, Secretary-General Guterres sent a letter to all UN members warning of an "imminent financial collapse" of the organization.
In 2023, Tennessee enacted legislation targeting programs originating from the UN, including the 2030 Agenda. The legislation aimed to block the implementation of these programs within the state.
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.
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