Congo Crisis in the context of "United Nations Security Council"

Dag Hjalmar Agne Carl Hammarskjöld (English: /ˈhæmərʃʊld/ HAM-ər-shuuld, Swedish: [ˈdɑːɡ ˈhâmːarˌɧœld] ; 29 July 1905 – 18 September 1961) was a Swedish economist and diplomat who served as the second secretary-general of the United Nations from April 1953 until his death in a plane crash in September 1961. As of 2025, he remains the youngest person to have held the post, having been only 47 years old when he was elected. He was a son of Hjalmar Hammarskjöld, who served as Prime Minister of Sweden from 1914 to 1917.

Hammarskjöld's tenure was characterized by efforts to strengthen the newly-formed UN both internally and externally. He led initiatives to improve morale and organizational efficiency while seeking to make the UN more responsive to global issues. He presided over the creation of the first UN peacekeeping forces in Egypt (the UNEF) and the Congo (the ONUC) and personally intervened to defuse or resolve diplomatic crises. Hammarskjöld's second term was cut short when he died in a plane crash while en route to cease-fire negotiations during the Congo Crisis.

The Democratic Republic of the Congo (DRC), also known as the DR Congo, Congo-Kinshasa, or simply the Congo, or more infrequently Zaire (its official name from 1971 to 1997), is a country in Central Africa. By land area, it is the second-largest country in Africa and the 11th-largest in the world. With a population of around 112 million, the DR Congo is the fourth-most populous in Africa and the most populous nominally Francophone country in the world. French is the official and most widely spoken language, though there are over 200 indigenous languages. The national capital and largest city is Kinshasa, which is also the economic center. The country is bordered by the Republic of the Congo, the Cabinda exclave of Angola, and the South Atlantic Ocean to the west; the Central African Republic and South Sudan to the north; Uganda, Rwanda, Burundi, and Tanzania (across Lake Tanganyika) to the east; and Zambia and Angola to the south. Centered on the Congo Basin, most of the country's terrain is covered by dense rainforests and is crossed by many rivers, while the east and southeast are mountainous.

The territory of the Congo was first inhabited by Central African foragers around 90,000 years ago and was settled in the Bantu expansion about 2,000 to 3,000 years ago. In the west, the Kingdom of Kongo ruled around the mouth of the Congo River from the 14th to the 19th century. In the center and east, the empires of Mwene Muji, Luba, and Lunda ruled between the 15th and 19th centuries. These kingdoms were broken up by Europeans during the colonization of the Congo Basin. King Leopold II of Belgium acquired rights to the Congo territory in 1885 and called it the Congo Free State. In 1908, Leopold ceded the territory after international pressure in response to widespread atrocities, and it became a Belgian colony. Congo achieved independence from Belgium in 1960 and was immediately confronted by a series of secessionist movements, the assassination of Prime Minister Patrice Lumumba, and the seizure of power by Mobutu Sese Seko in 1965. Mobutu renamed the country Zaire in 1971 and imposed a personalist dictatorship.

The decolonisation of Africa was a series of political developments in Africa that spanned from the mid-1950s to 1975, during the Cold War. Colonial governments formed during the Scramble for Africa gave way to sovereign states in a process often marred by violence, political turmoil, widespread unrest, and organised revolts. Major events in the decolonisation of Africa included the Mau Mau rebellion, the Algerian War, the Congo Crisis, the Angolan War of Independence, the Zanzibar Revolution, and the events leading to the Nigerian Civil War.

On 18 September 1961, a DC-6 passenger aircraft of Transair Sweden operating for the United Nations (UN) crashed near Ndola, Northern Rhodesia (present-day Zambia). The crash resulted in the deaths of all people on board, including Dag Hammarskjöld, the second secretary-general of the United Nations, and 15 others. Hammarskjöld had been en route to ceasefire negotiations with Moïse Tshombe during the Congo Crisis. Three official inquiries failed to conclusively determine the cause. Some historians and military experts like Susan Williams have criticized the official inquiries, pointing to evidence of foul play that had been omitted from the inquiries.

Hammarskjöld's death caused a succession crisis at the UN when the Security Council was tasked with selecting his successor.

The United Nations Operation in the Congo (French: Opération des Nations Unies au Congo, abbreviated ONUC) was a United Nations peacekeeping force which was deployed in the Republic of the Congo in 1960 in response to the Congo Crisis. The ONUC was the UN's first peacekeeping mission with significant military capability, and remains one of the largest UN operations in size and scope.

The Congo descended into chaos and disorder after it became independent from Belgium on 30 June 1960. This prompted a swift return of Belgian troops, under the pretext of restoring order and protecting its nationals. In response to the Congolese government's appeal for assistance, on 14 July 1960 the United Nations Security Council passed Resolution 143 (S/4387), which called on Belgium to withdraw its troops and authorized the UN Secretary-General to provide the Congolese government with military assistance. The first UN troops, drawn mostly from African and Asian states, reached the Congo the following day.