The United Nations (UN) is an intergovernmental organization founded in 1945 with the core mission of maintaining international peace and security. It aims to foster friendly relations among nations, promote international cooperation, and serve as a central platform for harmonizing global actions towards shared objectives. Established by the UN Charter, the organization seeks to prevent conflict, address global challenges, and uphold international law.
The UN has accused the US of violating international law by conducting deadly airstrikes on boats in the Caribbean and Pacific, alleging extrajudicial killings. The U.N. human rights chief urges the U.S. to halt these strikes.
In 1919, the Covenant of the League of Nations was ratified by 42 nations, which subsequently led to the League of Nations formally coming into being on January 10, 1920.
On January 10, 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. It began with four permanent members—the United Kingdom, France, Italy, and Japan.
In 1933, the League of Nations 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 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, the League of Nations effectively closed down after World War II broke out.
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, defining goals for the post-war world.
In September 1941, at the subsequent meeting of the Inter-Allied Council in London, 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.
In December 1941, Roosevelt and Churchill met at the White House for the Arcadia Conference. Also, 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.
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.
In October 1943, the 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.
From 21 September to 7 October 1944, delegations from 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, and further negotiations with the Soviet Union, resolved all the issues of the new international organization.
By March 1, 1945, 21 additional states had signed the Declaration by the United Nations, contributing to the growing international support for the organization.
On April 25, 1945, the UN Conference on International Organization opened in San Francisco, attended by 50 nations' governments and a number of non-governmental organizations, marking a significant step towards the UN's formation.
On June 1945, the United Nations was established through the signing of the UN Charter. The UN's mission was to maintain international peace and security, promote friendly relations among states, foster international cooperation, and harmonize state actions towards these goals.
On June 26, 1945, the representatives of 50 countries signed the Charter of the United Nations, completing the drafting process and paving the way for the UN's official establishment.
On October 24, 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, regulation of armaments was included in the writing of the UN Charter to limit 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, marking the formal start of the UN's operations.
The first session of the General Assembly convened on January 10, 1946, in the Methodist Central Hall in London. It comprised representatives of 51 nations.
In 1946, the United Nations Children's Fund (UNICEF) was created to aid European children after the Second World War, later expanding its mission to provide aid around the world and uphold the Convention on the Rights of the Child.
On November 29, 1947, the General Assembly approved resolution 181, a proposal to partition Palestine into two states, with Jerusalem placed under a special international regime.
Since 1947, the UN has carried out 71 peacekeeping operations.
On September 14, 1948, construction began on the headquarters of the UN in New York City, marking a key milestone in establishing a permanent base for the organization.
In 1948, the General Assembly adopted the Universal Declaration of Human Rights, drafted by a committee headed by Eleanor Roosevelt and René Cassin, proclaiming basic civil, political, and economic rights.
UN peacekeepers with the United Nations Truce Supervision Organization (UNTSO) have been stationed in the Middle East since 1948, marking 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, both claiming to be the sole government of China.
On July 7, 1950, the Security Council passed a resolution authorizing a US-led coalition to repel the North Korean invasion of South Korea, in the absence of the Soviet Union.
In 1950, the Soviet Union boycotted the organization in protest to China's seat at the UN Security Council being given to the anti-communist Republic of China.
On October 9, 1952, the construction of the UN Headquarters in New York City was completed, providing a permanent base for the organization's operations.
On July 27, 1953, the Korean Armistice Agreement was signed, marking the end of 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, for all its flaws, "the United Nations represents man's best organized hope to substitute the conference table for the battlefield".
In 1954, the UN High Commissioner for Refugees was awarded the Nobel Peace Prize.
On November 7, 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 July 14, 1960, the UN established the United Nations Operation in the Congo (or UNOC), the largest military force of its early decades.
In 1960 alone, 17 new states joined the UN, 16 of them from Africa, due to the spread of decolonization.
In 1960, the General Assembly adopted the Declaration on the Granting of Independence to Colonial Countries and Peoples, with no votes against but abstentions from major colonial powers, marking a significant step towards decolonization.
By May 11, 1964, the United Nations Operation in the Congo (UNOC) succeeded in bringing order to Katanga, restoring it to the control of the Democratic Republic of the Congo.
The Group of 77 (G77) was founded on June 15, 1964, by the "Joint Declaration of the Seventy-Seven Countries" issued at the United Nations Conference on Trade and Development (UNCTAD).
In 1965, Indonesia attempted to withdraw its membership from the United Nations, in protest to the election of Malaysia as a non-permanent member of the Security Council.
In 1965, UNICEF won the Nobel Peace Prize in recognition of their work.
After forming CONEFO as a rival to the UN, Indonesia resumed its membership in 1966.
In 1967, the Group of 77 held its first major meeting in Algiers, where it adopted the Charter of Algiers and established the basis for permanent institutional structures.
In 1969, the International Labour Organization won the Nobel Peace Prize in recognition of their work.
On October 24, 1971, the Hymn to the United Nations, with lyrics by W. H. Auden and performed by Pau Casals, was performed on the occasion of the UN's 26th anniversary.
On October 25, 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).
Disagreements in the Security Council are seen as having failed to prevent the Bangladesh genocide in 1971.
From 1971 to 1985, Brian Urquhart served as the under-secretary-general of the UN.
In 1971, amid growing debate over the representation of the Chinese people on the mainland, the General Assembly passed a resolution recognizing the PRC as "the only legitimate representatives of China to the United Nations."
In 1972, the UN Environmental Programme (UNEP) was formed, marking the beginning of the UN making environmental issues a prominent part of its agenda.
On November 10, 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.
In 1976, the General Assembly established the Joint Inspection Unit to seek out 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 on a global scale.
In 1980, the World Health Organization (WHO) announced that the eradication of smallpox had been completed, marking a monumental achievement in global health and disease control.
In 1981, the UN High Commissioner for Refugees was awarded the Nobel Peace Prize, becoming one of only 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 (or UNESCO) over allegations of mismanagement, followed by the United Kingdom and Singapore.
From 1971 to 1985, Brian Urquhart served as the under-secretary-general of the UN.
Between 1988 and 2000, the number of adopted Security Council resolutions more than doubled, and the peacekeeping budget increased more than tenfold.
In 1988, the Somali civil war began, which Mohamed Sahnoun claimed presented the UN with missed opportunities to prevent major human tragedies, according to his 1994 book.
In 1988, the UN Peacekeeping Forces won the Nobel Peace Prize in recognition of their work.
In 1988, the UN Peacekeeping forces as a whole received the Nobel Peace Prize.
In 1988, the UNEP and the World Meteorological Organization established the Intergovernmental Panel on Climate Change (IPCC), to assess and report on research on global warming.
In 1989, the Convention on the Rights of the Child was adopted by the General Assembly, establishing international standards for the protection and well-being of children worldwide.
In January 1991, the Siad Barre regime fell, which Mohamed Sahnoun claimed presented the UN with missed opportunities to prevent major human tragedies, according to his 1994 book.
On December 16, 1991, shortly after the end of the Cold War, the 1975 resolution declaring Zionism to be a form of racism was repealed.
In 1991, the UN authorized a US-led coalition that repulsed Iraq's invasion of Kuwait.
Boutros Boutros-Ghali, the secretary-general from 1992 to 1996, 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, seeking to give new impetus to UN environmental efforts following a lack of success in the first two decades.
In 1992, the UN intervention in Somalia failed. According to Mohamed Sahnoun, the UN was outperformed by NGOs, and this failure was analyzed in his 1994 book.
In 1993, following the World Conference on Human Rights, the United Nations Commission on Human Rights was formed to oversee human rights issues for the UN, aiming to strengthen the organization's role in promoting and protecting human rights globally.
On November 1, 1994, the Trusteeship Council suspended its operations upon the independence of Palau, the last remaining UN trustee territory.
Disagreements in the Security Council are seen as having failed to prevent the Rwandan genocide in 1994.
In 1994, Mohamed Sahnoun published "Somalia: The Missed Opportunities", analyzing the failure of the 1992 UN intervention in Somalia.
In 1994, the Office of Internal Oversight Services (OIOS) was established by the General Assembly to serve as an efficiency watchdog.
In 1994, the UN Assistance Mission for Rwanda failed to intervene in the Rwandan genocide amidst indecision in the Security Council.
Boutros Boutros-Ghali, the secretary-general from 1992 to 1996, initiated a reform of the Secretariat, somewhat reducing the size of the organization.
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.
In December 2000, the Assembly revised the scale of assessments in response to pressure from the United States. As part of that revision, the regular budget ceiling was reduced from 25% to 22%.
Between 1988 and 2000, the number of adopted Security Council resolutions more than doubled, and the peacekeeping budget increased more than tenfold.
In 2000, the 192 UN member states agreed to achieve eight Millennium Development Goals by 2015, focusing on poverty reduction, education, health, and environmental sustainability.
The Millennium Summit was held in 2000. World leaders adopted the Millennium Development Goals (MDGs), committing to international development in areas such as poverty reduction, gender equality, and public health.
In 2001, the UN as a whole was awarded the Nobel Peace Prize, sharing it with Annan.
In 2001, the invasion of Afghanistan was overseen by NATO, with international interventions taking various forms.
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, marking a milestone in addressing the rights and concerns of indigenous populations within the UN system.
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 in its recently ended Oil-for-Food Programme, including billions of dollars of kickbacks.
In 2005, a RAND Corporation study found the UN to be successful in two-thirds of its peacekeeping efforts and that 87.5% of UN cases are at peace, compared with 50% of U.S. cases.
In 2005, the International Atomic Energy Agency (which reports to the UN) won the Nobel Peace Prize in recognition of their work.
The 2005 World Summit reaffirmed the UN's focus on promoting development, peacekeeping, human rights, and global security.
In 2006, the Human Rights Council replaced the UN Commission on Human Rights, and the General Assembly passed a Declaration on the Rights of Indigenous People, marking significant developments in the UN's approach to human rights.
In 2007, U.S. Representative Ron Paul authored H.R. 1146, the American Sovereignty Restoration Act, to effect the United States' withdrawal from the United Nations.
In 2007, the IPCC received the 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."
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, during the final battles of the Sri Lankan Civil War, the UN suffered a "systemic failure". This was determined in an internal review in 2013.
In 2010, the UN suffered the worst loss of life in its history when 101 personnel died in the Haiti earthquake.
South Sudan joined the UN on July 14, 2011, becoming the 193rd member state.
In 2011, the General Assembly passed its first resolution recognizing the rights of members of the LGBTQ+ community, signaling a step towards greater inclusivity and protection for LGBTQ+ individuals within the UN framework.
In 2012, then French President François Hollande stated that "France trusts the United Nations. She knows that no state, no matter how powerful, can solve urgent problems, fight for development and bring an end to all crises. France wants the UN to be the centre of global governance".
By November 2013, the Group of 77 (G77) at the UN had expanded to 133 member countries.
In 2013, an internal review of UN actions during the final battles of the Sri Lankan Civil War in 2009 concluded that the organization had suffered a "systemic failure".
In 2013, the UN-supported Organisation for the Prohibition of Chemical Weapons won the Nobel Peace Prize in recognition of their work.
In September 2015, Saudi Arabia's Faisal bin Hassan Trad was elected chair of an advisory committee in the UN Human Rights Council. This move was criticized by the UN Watch.
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 of Portugal became the ninth secretary-general of the UN. He had previously served as the UN High Commissioner for Refugees.
In 2017, António Guterres of Portugal replaced Ban Ki-moon as the secretary-general of the UN.
In June 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, "In the middle of the Cold War, the chances of reaching any consensus had been slim, which is why the UN had stood idle as Soviet tanks rolled into Hungary or U.S. planes dropped napalm on the Vietnamese countryside. Even after the Cold War, divisions within the Security Council continued to hamstring the UN's ability to tackle problems. Its member states lacked either the means or the collective will to reconstruct failing states like Somalia, or prevent an ethnic slaughter in places like Sri Lanka."
As of April 2021 almost 5,600 organizations have the consultative status with the ECOSOC.
As of April 2021, over 88,000 UN peacekeeping personnel from 121 nations have been deployed on missions.
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).
In 2021, the peacekeeping budget for the 2021–2022 fiscal year is $6.38 billion, supporting 66,839 personnel deployed in 12 missions worldwide.
Studies published between 2008 and 2021 determined UN peacekeeping operations to be more effective at ensuring long-lasting peace and minimizing civilian casualties.
As of 2022, the most recent iteration of the American Sovereignty Restoration Act is H.R.7806, introduced by Mike D. Rogers.
In 2022, 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).
In 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.
In 2024, the UN budget was set at $3.59 billion, which does not include additional resources donated by members.
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 UNO a Honorary degree which was given in the hands of António Guterres.
On May 19, 2025, the UN faced a financial crisis due to delays in member state payments. Only 61 countries paid their dues on time. This crisis is causing massive budget cuts.
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. This legislation was enacted in 2023.
In June 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.
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