Question: When did Cameroon's main ally change to driving on the right?

full_context: Document 1: Left–right political spectrum: The terms ``left ''and`` right'' appeared during the French Revolution of 1789 when members of the National Assembly divided into supporters of the king to the president's right and supporters of the revolution to his left. One deputy, the Baron de Gauville, explained, ``We began to recognize each other: those who were loyal to religion and the king took up positions to the right of the chair so as to avoid the shouts, oaths, and indecencies that enjoyed free rein in the opposing camp. ''However, the Right opposed the seating arrangement because they believed that deputies should support private or general interests but should not form factions or political parties. The contemporary press occasionally used the terms`` left'' and ``right ''to refer to the opposing sides. When the National Assembly was replaced in 1791 by a Legislative Assembly comprising entirely new members, the divisions continued.`` Innovators'' sat on the left, ``moderates ''gathered in the centre, while the`` conscientious defenders of the constitution'' found themselves sitting on the right, where the defenders of the Ancien Régime had previously gathered. When the succeeding National Convention met in 1792, the seating arrangement continued, but following the coup d'état of 2 June 1793, and the arrest of the Girondins, the right side of the assembly was deserted, and any remaining members who had sat there moved to the centre. However, following the Thermidorian Reaction of 1794, the members of the far left were excluded, and the method of seating was abolished. The new constitution included rules for the assembly that would ``break up the party groups. ''
Document 2: Left- and right-hand traffic: A number of non-contiguous former British colonies in West Africa originally drove LHT and switched to RHT in the early 1970s to match the surrounding countries. Sierra Leone switched to RHT in 1971, Nigeria in 1972 and Ghana in 1974. Before this period The Gambia, a country entirely contained within RHT Senegal, had officially switched to RHT in 1965.
Document 3: Cameroon: Its foreign policy closely follows that of its main ally, France (one of its former colonial rulers). Cameroon relies heavily on France for its defence, although military spending is high in comparison to other sectors of government.President Biya has engaged in a decades-long clash with the government of Nigeria over possession of the oil-rich Bakassi peninsula. Cameroon and Nigeria share a 1,000-mile (1 600 km) border and have disputed the sovereignty of the Bakassi peninsula. In 1994 Cameroon petitioned the International Court of Justice to resolve the dispute. The two countries attempted to establish a cease-fire in 1996, however, fighting continued for years. In 2002, the ICJ ruled that the Anglo-German Agreement of 1913 gave sovereignty to Cameroon. The ruling called for a withdrawal by both countries and denied the request by Cameroon for compensation due to Nigeria's long-term occupation. By 2004, Nigeria had failed to meet the deadline to handover the peninsula. A UN-mediated summit in June 2006 facilitated an agreement for Nigeria to withdraw from the region and both leaders signed the Greentree Agreement. The withdrawal and handover of control was completed by August 2006.
Document 4: Ministry of Defence (United Kingdom): The MoD has since been regarded as a leader in elaborating the post-Cold War organising concept of "defence diplomacy". As a result of the Strategic Defence and Security Review 2010, Prime Minister David Cameron signed a 50-year treaty with French President Nicolas Sarkozy that would have the two countries co-operate intensively in military matters. The UK is establishing air and naval bases in the Persian Gulf, located in the UAE and Bahrain. A presence in Oman is also being considered.
Document 5: Napoleon: After the fall of Napoleon, not only was Napoleonic Code retained by conquered countries including the Netherlands, Belgium, parts of Italy and Germany, but has been used as the basis of certain parts of law outside Europe including the Dominican Republic, the US state of Louisiana and the Canadian province of Quebec. The memory of Napoleon in Poland is favorable, for his support for independence and opposition to Russia, his legal code, the abolition of serfdom, and the introduction of modern middle class bureaucracies.
Document 6: Imperialism: In World War II, Charles de Gaulle and the Free French used the overseas colonies as bases from which they fought to liberate France. However after 1945 anti-colonial movements began to challenge the Empire. France fought and lost a bitter war in Vietnam in the 1950s. Whereas they won the war in Algeria, the French leader at the time, Charles de Gaulle, decided to grant Algeria independence anyway in 1962. Its settlers and many local supporters relocated to France. Nearly all of France's colonies gained independence by 1960, but France retained great financial and diplomatic influence. It has repeatedly sent troops to assist its former colonies in Africa in suppressing insurrections and coups d’état.
Document 7: Modern history: The changes were accompanied by violent turmoil which included the trial and execution of the king, vast bloodshed and repression during the Reign of Terror, and warfare involving every other major European power. Subsequent events that can be traced to the Revolution include the Napoleonic Wars, two separate restorations of the monarchy, and two additional revolutions as modern France took shape. In the following century, France would be governed at one point or another as a republic, constitutional monarchy, and two different empires.
Document 8: Central African Republic: What is today the Central African Republic has been inhabited for millennia; however, the country's current borders were established by France, which ruled the country as a colony starting in the late 19th century. After gaining independence from France in 1960, the Central African Republic was ruled by a series of autocratic leaders; by the 1990s, calls for democracy led to the first multi-party democratic elections in 1993. Ange-Félix Patassé became president, but was later removed by General François Bozizé in the 2003 coup. The Central African Republic Bush War began in 2004 and, despite a peace treaty in 2007 and another in 2011, fighting broke out between various factions in December 2012, leading to ethnic and religious cleansing of the Muslim minority and massive population displacement in 2013 and 2014.
Document 9: Central African Republic: Patassé purged many of the Kolingba elements from the government and Kolingba supporters accused Patassé's government of conducting a "witch hunt" against the Yakoma. A new constitution was approved on 28 December 1994 but had little impact on the country's politics. In 1996–1997, reflecting steadily decreasing public confidence in the government's erratic behaviour, three mutinies against Patassé's administration were accompanied by widespread destruction of property and heightened ethnic tension. During this time (1996) the Peace Corps evacuated all its volunteers to neighboring Cameroon. To date, the Peace Corps has not returned to the Central African Republic. The Bangui Agreements, signed in January 1997, provided for the deployment of an inter-African military mission, to Central African Republic and re-entry of ex-mutineers into the government on 7 April 1997. The inter-African military mission was later replaced by a U.N. peacekeeping force (MINURCA).
Document 10: Southern Cameroons National Council: The Southern Cameroons National Council (SCNC) is a self - determination organisation seeking the independence of the anglophone Southern Cameroons from the predominantly francophone Republic of Cameroon (La République de Cameroun). It is a non-violent organization with the motto ``The force of argument, not the argument of force. ''Because the SCNC advocates separation from Cameroon, it has been declared an illegal organization by the government of Paul Biya. Security forces regularly interrupt SCNC meetings, arresting members and typically detaining them for several days before release.
Document 11: Namibia: Namibia follows a largely independent foreign policy, with persisting affiliations with states that aided the independence struggle, including Cuba. With a small army and a fragile economy, the Namibian Government's principal foreign policy concern is developing strengthened ties within the Southern African region. A dynamic member of the Southern African Development Community, Namibia is a vocal advocate for greater regional integration. Namibia became the 160th member of the UN on 23 April 1990. On its independence it became the fiftieth member of the Commonwealth of Nations.
Document 12: Nigeria: Nigeria's foreign policy was tested in the 1970s after the country emerged united from its own civil war. It supported movements against white minority governments in the Southern Africa sub-region. Nigeria backed the African National Congress (ANC) by taking a committed tough line with regard to the South African government and their military actions in southern Africa. Nigeria was also a founding member of the Organisation for African Unity (now the African Union), and has tremendous influence in West Africa and Africa on the whole. Nigeria has additionally founded regional cooperative efforts in West Africa, functioning as standard-bearer for the Economic Community of West African States (ECOWAS) and ECOMOG, economic and military organisations, respectively.
Document 13: Left- and right-hand traffic: In France, traditionally foot traffic had kept right, while carriage traffic kept left. Following the French Revolution, all traffic kept right. Following the Napoleonic Wars, the French imposed RHT on parts of Europe. During the colonial period, RHT was introduced by the French in New France, French West Africa, the Maghreb, French Indochina, the West Indies, French Guiana and the Réunion, among others.
Document 14: France–Vietnam relations: French -- Vietnamese relations started as early as the 17th century with the mission of the Jesuit father Alexandre de Rhodes. Various traders would visit Vietnam during the 18th century, until the major involvement of French forces under Pigneau de Béhaine from 1787 to 1789 helped establish the Nguyễn Dynasty. France was heavily involved in Vietnam in the 19th century under the pretext of protecting the work of Catholic missionaries in the country. France progressively carved for itself a huge colony, which would form French Indochina in 1887. France continued to rule Vietnam as a colony until France's defeat in the First Indochina War and the proclamation of Vietnam's independence in 1954.
Document 15: Imperialism: It became a moral justification to lift the world up to French standards by bringing Christianity and French culture. In 1884 the leading exponent of colonialism, Jules Ferry declared France had a civilising mission: "The higher races have a right over the lower races, they have a duty to civilize the inferior". Full citizenship rights – ‘’assimilation’’ – were offered, although in reality assimilation was always on the distant horizon. Contrasting from Britain, France sent small numbers of settlers to its colonies, with the only notable exception of Algeria, where French settlers nevertheless always remained a small minority.
ground_truth: Following the French Revolution
sub_queries: Who is Cameroon's main ally? Answer: France
when did France change to driving on the right Answer: Following the French Revolution