Question: When did Britain withdraw from the country where Al Khawalid was from?

full_context: Document 1: Al Khawalid: Al Khawalid ( "the Khawālid"; literally "the Khālids"), also spelled Al Khawaled, is a branch of the House of Khalifa, the ruling family of Bahrain. Al Khawalid is most often used to refer collectively to descendants of Khalid bin Ali Al Khalifa, which they are named after. The term also refers to brothers Khalid bin Ahmed Al Khalifa, the Royal Court Minister and Khalifa bin Ahmed Al Khalifa the Commander in Chief of the Bahrain Defence Force. For the purpose of this article, immediate descendants of Khalid bin Ali Al Khalifa will be referred to as "the Khalids", the aforementioned two brothers will be referred to as "the Khawalid brothers" and the family branch collectively as "Al Khawalid".
Document 2: British Empire: Though Britain and the empire emerged victorious from the Second World War, the effects of the conflict were profound, both at home and abroad. Much of Europe, a continent that had dominated the world for several centuries, was in ruins, and host to the armies of the United States and the Soviet Union, who now held the balance of global power. Britain was left essentially bankrupt, with insolvency only averted in 1946 after the negotiation of a $US 4.33 billion loan from the United States, the last instalment of which was repaid in 2006. At the same time, anti-colonial movements were on the rise in the colonies of European nations. The situation was complicated further by the increasing Cold War rivalry of the United States and the Soviet Union. In principle, both nations were opposed to European colonialism. In practice, however, American anti-communism prevailed over anti-imperialism, and therefore the United States supported the continued existence of the British Empire to keep Communist expansion in check. The "wind of change" ultimately meant that the British Empire's days were numbered, and on the whole, Britain adopted a policy of peaceful disengagement from its colonies once stable, non-Communist governments were established to assume power. This was in contrast to other European powers such as France and Portugal, which waged costly and ultimately unsuccessful wars to keep their empires intact. Between 1945 and 1965, the number of people under British rule outside the UK itself fell from 700 million to five million, three million of whom were in Hong Kong.
Document 3: British Empire: In 1951, the Conservative Party returned to power in Britain, under the leadership of Winston Churchill. Churchill and the Conservatives believed that Britain's position as a world power relied on the continued existence of the empire, with the base at the Suez Canal allowing Britain to maintain its pre-eminent position in the Middle East in spite of the loss of India. However, Churchill could not ignore Gamal Abdul Nasser's new revolutionary government of Egypt that had taken power in 1952, and the following year it was agreed that British troops would withdraw from the Suez Canal zone and that Sudan would be granted self-determination by 1955, with independence to follow. Sudan was granted independence on 1 January 1956.
Document 4: British Empire: Though Britain and the empire emerged victorious from the Second World War, the effects of the conflict were profound, both at home and abroad. Much of Europe, a continent that had dominated the world for several centuries, was in ruins, and host to the armies of the United States and the Soviet Union, who now held the balance of global power. Britain was left essentially bankrupt, with insolvency only averted in 1946 after the negotiation of a $US 4.33 billion loan (US$56 billion in 2012) from the United States, the last instalment of which was repaid in 2006. At the same time, anti-colonial movements were on the rise in the colonies of European nations. The situation was complicated further by the increasing Cold War rivalry of the United States and the Soviet Union. In principle, both nations were opposed to European colonialism. In practice, however, American anti-communism prevailed over anti-imperialism, and therefore the United States supported the continued existence of the British Empire to keep Communist expansion in check. The "wind of change" ultimately meant that the British Empire's days were numbered, and on the whole, Britain adopted a policy of peaceful disengagement from its colonies once stable, non-Communist governments were available to transfer power to. This was in contrast to other European powers such as France and Portugal, which waged costly and ultimately unsuccessful wars to keep their empires intact. Between 1945 and 1965, the number of people under British rule outside the UK itself fell from 700 million to five million, three million of whom were in Hong Kong.
Document 5: King of Saudi Arabia: The kings since Ibn Saud's death have all been his sons, and all likely immediate successors to the reigning King Salman will be from his progeny. Sons of Ibn Saud are considered to have primary claim on the throne of Saudi Arabia. This makes the Saudi monarchy quite distinct from Western monarchies, which usually feature large, clearly defined royal families and orders of succession. The current Crown Prince is the first grandson of Ibn Saud to be in the line of succession.
Document 6: British Empire: While the Suez Crisis caused British power in the Middle East to weaken, it did not collapse. Britain again deployed its armed forces to the region, intervening in Oman (1957), Jordan (1958) and Kuwait (1961), though on these occasions with American approval, as the new Prime Minister Harold Macmillan's foreign policy was to remain firmly aligned with the United States. Britain maintained a military presence in the Middle East for another decade. In January 1968, a few weeks after the devaluation of the pound, Prime Minister Harold Wilson and his Defence Secretary Denis Healey announced that British troops would be withdrawn from major military bases East of Suez, which included the ones in the Middle East, and primarily from Malaysia and Singapore. The British withdrew from Aden in 1967, Bahrain in 1971, and Maldives in 1976.
Document 7: Overseas military bases of the United Kingdom: The United Kingdom is still considered and remains a global power even into the 21st century; this is evidenced through the nation's 15 overseas military bases, making it second only to the United States in terms of total overseas bases worldwide. Currently, there is also the possibility of an additional two new bases being built in Oman and the United Arab Emirates in the near future. Note that both the United Arab Emirates and Oman were once under British rule, showing the impact of colonialism and the British armed forces military presence across the globe, even into the 21st century.
Document 8: British Empire: In July 1956, Nasser unilaterally nationalised the Suez Canal. The response of Anthony Eden, who had succeeded Churchill as Prime Minister, was to collude with France to engineer an Israeli attack on Egypt that would give Britain and France an excuse to intervene militarily and retake the canal. Eden infuriated US President Dwight D. Eisenhower, by his lack of consultation, and Eisenhower refused to back the invasion. Another of Eisenhower's concerns was the possibility of a wider war with the Soviet Union after it threatened to intervene on the Egyptian side. Eisenhower applied financial leverage by threatening to sell US reserves of the British pound and thereby precipitate a collapse of the British currency. Though the invasion force was militarily successful in its objectives, UN intervention and US pressure forced Britain into a humiliating withdrawal of its forces, and Eden resigned.
Document 9: King Khalid Foundation: The King Khalid Foundation is a charitable organization established in Saudi Arabia in 2001 by the family of the late King Khalid, who ruled the country from 1975 until his death in 1982.
Document 10: Ministry of Defense (Kuwait): The Kuwait Ministry of Defense (Arabic: وزارة الدفاع الكويتية) is one of the governmental bodies of Kuwait. Its minister in charge is a member of the Cabinet of Kuwait. The current minister of defense is Sheikh Nasser Sabah Al-Ahmad Al-Sabah, the current ruler's eldest son.
Document 11: Mohammed bin Hamad bin Khalifa Al Thani: Sheikh Mohammed bin Hamad bin Khalifa Al Thani (; born 18 April 1988) is a member of the Royal House of Thani. He is the brother of the Emir of Qatar, Sheikh Tamim bin Hamad Al Thani and the son of the former Emir of Qatar, Sheikh Hamad bin Khalifa Al Thani, with his second wife Sheikha Moza bint Nasser.
Document 12: Abdullah bin Hamad bin Isa Al Khalifa: Abdullah bin Hamad bin Isa Al Khalifa (born 30 June 1976) is the second son of the present King of Bahrain, Hamad ibn Isa Al Khalifah and his first wife, Sabika bint Ibrahim Al Khalifa.
Document 13: Khalifa Bin Yousef: Khalifa Bin Yousef was a statesman who played a significant role in the unification of The United Arab Emirates and in the economic and political life of the time in the Persian Gulf.
Document 14: British Empire: The Suez Crisis very publicly exposed Britain's limitations to the world and confirmed Britain's decline on the world stage, demonstrating that henceforth it could no longer act without at least the acquiescence, if not the full support, of the United States. The events at Suez wounded British national pride, leading one MP to describe it as "Britain's Waterloo" and another to suggest that the country had become an "American satellite". Margaret Thatcher later described the mindset she believed had befallen the British political establishment as "Suez syndrome", from which Britain did not recover until the successful recapture of the Falkland Islands from Argentina in 1982.
Document 15: Hamad bin Isa Al Khalifa: Hamad bin Isa bin Salman Al Khalifa ( ""; born 28 January 1950) is the King of Bahrain. He has been the monarch of Bahrain since 6 March 1999, initially reigning as emir, and from 14 February 2002, as the first king. He is the son of Isa bin Salman Al Khalifa, the previous and first emir. The country has been ruled by the Al Khalifa dynasty since 1783.
ground_truth: 1971
sub_queries: Al Khawalid >> country Answer: Bahrain
When did Britain withdraw from Bahrain ? Answer: 1971