Question: What South African politician formed a government of national unity with nelson Mandela's African National Congress and Mangosuthu Buthelezi's Inkatha Freedom Party?

full_context: Document 1: Cabinet of Nelson Mandela: Nelson Mandela took oath as President of South Africa on 10 May 1994 and announced his cabinet on 11 May 1994. The cabinet included members of Mandela's African National Congress, National Party and Inkatha Freedom Party, as it was required by law that all parties winning more than 20 seats in the parliament be given representation in the cabinet.
Document 2: Congress of the People (1955): The Congress of the People was a gathering held in Kliptown on 26 June 1955 to lay out the vision of the South African people. The Freedom Charter was drawn-up at the gathering; the charter became the manifesto of the African National Congress and a symbol of internal resistance against apartheid.
Document 3: 1994 in South Africa: 1994 in South Africa saw the transition from South Africa's National Party government who had ruled the country since 1948 and had advocated the apartheid system for most of its history, to the African National Congress (ANC) who had been outlawed in South Africa since the 1950s for its opposition to apartheid. The ANC won a majority in the first multiracial election held under universal suffrage. Previously, only white people were allowed to vote. There were some incidents of violence in the Bantustans during the lead up to the elections as some of the leaders of the Bantusans did not want to participate in the elections, while some citizens there wanted to vote and become part of South Africa. There were also bombings aimed at both the African National Congress and the National Party and politically-motivated murders of leaders of the opposing ANC and Inkatha Freedom Party (IFP).
Document 4: African National Congress Women's League: The African National Congress Women's League is the women's wing of the African National Congress (ANC). It was founded in 1931 as the Bantu Women's League, with Charlotte Maxeke as its first president. It was integrated into the ANC during the period from 1943, when women were first admitted as members of the ANC, to 1948, when the ANCWL was officially founded. It participated with the Federation of South African Women in protests against the apartheid-era government, such as the 1952 Defiance Campaign and the Women's March of 9 August 1956. In 1956, Lilian Ngoyi became the first elected female member of the ANC National Executive Committee. In 1960 the organization was banned along with the ANC forcing its central leaders underground; it was unbanned in 1990 when the ANC was likewise unbanned.
Document 5: Members of the 1922 Seanad: Seanad Éireann, the upper house of the Oireachtas (legislature) of the Irish Free State, was first constituted on 8 December 1922. The Free State Seanad was elected in stages and thus considered to be in permanent session. However, as a gesture of continuity with its Free State predecessor, the first Seanad elected after 1937 is numbered as the "Second Seanad". The Free State Senate, despite the occurrence of five senatorial elections before its abolition, is considered to have been a single 'Seanad' for the duration of its existence and is thus referred for that whole period as the "First Seanad".
Document 6: B. J. Vorster: Balthazar Johannes Vorster (] ; 13 December 1915 – 10 September 1983), better known as John Vorster, served as the Prime Minister of South Africa from 1966 to 1978 and as the fourth State President of South Africa from 1978 to 1979. Vorster was known for his staunch adherence to apartheid, overseeing (as Minister of Justice) the Rivonia Trial in which Nelson Mandela was sentenced to life imprisonment for , and (as Prime Minister) the Terrorism Act, the complete abolition of non-white political representation, the Soweto Riots and the Steve Biko crisis. He conducted a more pragmatic foreign policy than his predecessors in an effort to improve relations between the white minority government and South Africa's neighbours, particularly after the break-up of the Portuguese colonial empire. Shortly after the Internal Settlement in Rhodesia, in which he was instrumental, he was implicated in the Muldergate Scandal and resigned the premiership in favour of the ceremonial presidency, which he was forced to give up as well eight months later.
Document 7: 22nd South African Parliament: The 22nd Parliament of the Republic of South Africa was elected in the elections of 27 April 1994; it was the first parliament in South Africa's history to be elected by voters of all races. Nelson Mandela's African National Congress formed a government of national unity with F. W. de Klerk's National Party and Mangosuthu Buthelezi's Inkatha Freedom Party. The three racially based houses from previous parliaments were replaced with the re-introduced Senate and National Assembly. In 1997, on the introduction of the final Constitution, the Senate was replaced by the National Council of Provinces, which continues to serve as the upper house of South Africa's Parliament.
Document 8: Law of South Africa: South Africa has a 'hybrid' or 'mixed' legal system, formed by the interweaving of a number of distinct legal traditions: a civil law system inherited from the Dutch, a common law system inherited from the British, and a customary law system inherited from indigenous Africans (often termed African Customary Law, of which there are many variations depending on the tribal origin). These traditions have had a complex interrelationship, with the English influence most apparent in procedural aspects of the legal system and methods of adjudication, and the Roman-Dutch influence most visible in its substantive private law. As a general rule, South Africa follows English law in both criminal and civil procedure, company law, constitutional law and the law of evidence; while Roman-Dutch common law is followed in the South African contract law, law of delict (tort), law of persons, law of things, family law, etc. With the commencement in 1994 of the interim Constitution, and in 1997 its replacement, the final Constitution, another strand has been added to this weave.
Document 9: Jacob Zuma: Jacob Gedleyihlekisa Zuma (born 12 April 1942) is a South African politician. He has served as the President of South Africa since 2009. Zuma is the President of the African National Congress (ANC), the governing political party, and was Deputy President of South Africa from 1999-2005.
Document 10: Inkatha Freedom Party: The Inkatha Freedom Party (IFP) is a political party in South Africa. Since its founding, it has been led by Mangosuthu Buthelezi. It is currently the fourth largest party in the National Assembly of South Africa, having lost almost half its seats and votes in the 2014 general election and yielding third place to the newly formed Economic Freedom Fighters.
Document 11: Internal resistance to apartheid: Internal resistance to "apartheid" in South Africa originated from several independent sectors of society and alternatively took the form of social movements, passive resistance, or guerrilla warfare. Mass action against the ruling National Party government, coupled with South Africa's growing international isolation and economic sanctions, were instrumental factors in ending racial segregation and discrimination. Both black and white South African activists such as Steve Biko, Desmond Tutu, Nelson Mandela, Harry Schwarz, and Joe Slovo were involved with various anti-apartheid causes. By the 1980s, there was continuous interplay between violent and non-violent action, and this interplay was a notable feature of resistance against apartheid from 1983 until South Africa's first multiracial elections under a universal franchise in 1994.
Document 12: F. W. de Klerk: Frederik Willem de Klerk, DMS (] ; born 18 March 1936) is a South African politician who served as the country's State President from August 1989 to May 1994. He was the seventh and last head of state of South Africa under the apartheid era. De Klerk was also leader of the National Party (which later became the New National Party) from February 1989 to September 1997.
Document 13: Cyril Ramaphosa: Matamela Cyril Ramaphosa (born 17 November 1952) is a South African politician, businessman, activist, and trade union leader who has served as the Deputy President of South Africa under President Jacob Zuma since 2014. He was elected as Deputy President of the African National Congress (ANC) at the ANC National Conference in Mangaung in December 2012. He is also the Chairman of the National Planning Commission, which is responsible for strategic planning for the future of South Africa, with the goal of rallying the nation "around a common set of objectives and priorities to drive development over the longer term".
Document 14: Presidency of Nelson Mandela: Nelson Mandela, an anti-apartheid activist, lawyer, and former political prisoner, was elected to the presidency of South Africa in 1994, following which he served one term in office (1994–99). He was the first non-white head of state in South African history, as well as the first to take office following the dismantling of the apartheid system and the introduction of multiracial democracy. Mandela was also the oldest head of state in South Africa's history, taking office at the age of seventy-five.
Document 15: 1990 in South Africa: 1990 in South Africa saw the official start of the process of ending Apartheid. President of South Africa, F.W. de Klerk announced plans to end apartheid. President De Klerk unbanned organisations that were banned by the government including the African National Congress, the South African Communist Party and the Pan Africanist Congress. The African National Congress' armed wing, Umkhonto we Sizwe, suspends its armed activity within South Africa. Political prisoners including Nelson Mandela were released. Nelson Mandela met ANC leader Oliver Tambo for the first time in 28 years at a meeting in Sweden. Mandela also traveled to England to thank the people for their support in the campaign to free him. South Africa withdrew its troops from Namibia, which was granted independence. 1990 also saw marches in support and against the formation of a new post-Apartheid South Africa.
ground_truth: Frederik Willem de Klerk