paragraph_text: The First British Empire was based on mercantilism, and involved colonies and holdings primarily in North America, the Caribbean, and India. Its growth was reversed by the loss of the American colonies in 1776. Britain made compensating gains in India, Australia, and in constructing an informal economic empire through control of trade and finance in Latin America after the independence of Spanish and Portuguese colonies about 1820. By the 1840s, Britain had adopted a highly successful policy of free trade that gave it dominance in the trade of much of the world. After losing its first Empire to the Americans, Britain then turned its attention towards Asia, Africa, and the Pacific. Following the defeat of Napoleonic France in 1815, Britain enjoyed a century of almost unchallenged dominance and expanded its imperial holdings around the globe. Increasing degrees of internal autonomy were granted to its white settler colonies in the 20th century.

paragraph_text: Before the attack on Pearl Harbor, the 800,000-member America First Committee vehemently opposed any American intervention in the European conflict, even as America sold military aid to Britain and the Soviet Union through the Lend-Lease program. Opposition to war in the U.S. vanished after the attack. On 8 December, the United States, the United Kingdom, Canada, and the Netherlands declared war on Japan, followed by China and Australia the next day. Four days after Pearl Harbor, Nazi Germany and Fascist Italy declared war on the United States, drawing the country into a two-theater war. This is widely agreed to be a grand strategic blunder, as it abrogated the benefit Germany gained by Japan's distraction of the U.S. (predicted months before in a memo by Commander Arthur McCollum)[nb 12] and the reduction in aid to Britain, which both Congress and Hitler had managed to avoid during over a year of mutual provocation, which would otherwise have resulted.

paragraph_text: 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.

paragraph_text: Sheikh Saeed bin Maktoum bin Hasher Al Maktoum (1878 – 9 September 1958) () was the Ruler of Dubai from 1912 until his death in 1958. He presided over Dubai during the end of the pearling boom and through the long and difficult recession that followed the collapse of the pearling market, transforming Dubai into an active trading hub which developed new markets and economic opportunities.

paragraph_text: Cork was originally a monastic settlement, reputedly founded by Saint Finbarr in the 6th century. Cork achieved an urban character at some point between 915 and 922 when Norseman (Viking) settlers founded a trading port. It has been proposed that, like Dublin, Cork was an important trading centre in the global Scandinavian trade network. The ecclesiastical settlement continued alongside the Viking longphort, with the two developing a type of symbiotic relationship; the Norsemen providing otherwise unobtainable trade goods for the monastery, and perhaps also military aid.

paragraph_text: Hayek's work on the microeconomics of the choice theoretics of investment, non-permanent goods, potential permanent resources, and economically-adapted permanent resources mark a central dividing point between his work in areas of macroeconomics and that of almost all other economists. Hayek's work on the macroeconomic subjects of central planning, trade cycle theory, the division of knowledge, and entrepreneurial adaptation especially, differ greatly from the opinions of macroeconomic "Marshallian" economists in the tradition of John Maynard Keynes and the microeconomic "Walrasian" economists in the tradition of Abba Lerner.

paragraph_text: In Arabia, Bahrain, which was referred to by the Greeks as Tylos, the centre of pearl trading, when Nearchus came to discover it serving under Alexander the Great. The Greek admiral Nearchus is believed to have been the first of Alexander's commanders to visit these islands. It is not known whether Bahrain was part of the Seleucid Empire, although the archaeological site at Qalat Al Bahrain has been proposed as a Seleucid base in the Persian Gulf. Alexander had planned to settle the eastern shores of the Persian Gulf with Greek colonists, and although it is not clear that this happened on the scale he envisaged, Tylos was very much part of the Hellenised world: the language of the upper classes was Greek (although Aramaic was in everyday use), while Zeus was worshipped in the form of the Arabian sun-god Shams. Tylos even became the site of Greek athletic contests.

paragraph_text: The loss of such a large portion of British America, at the time Britain's most populous overseas possession, is seen by some historians as the event defining the transition between the "first" and "second" empires, in which Britain shifted its attention away from the Americas to Asia, the Pacific and later Africa. Adam Smith's Wealth of Nations, published in 1776, had argued that colonies were redundant, and that free trade should replace the old mercantilist policies that had characterised the first period of colonial expansion, dating back to the protectionism of Spain and Portugal. The growth of trade between the newly independent United States and Britain after 1783 seemed to confirm Smith's view that political control was not necessary for economic success.

paragraph_text: Starting in 1940 (18 months before Pearl Harbor), the nation mobilized, giving high priority to air power. American involvement in World War II in 1940–41 was limited to providing war material and financial support to Britain, the Soviet Union, and the Republic of China. The U.S. entered officially on 8 December 1941 following the Japanese attack on Pearl Harbor, Hawaii. Japanese forces soon seized American, Dutch, and British possessions across the Pacific and Southeast Asia, except for Australia, which became a main American forward base along with Hawaii.

paragraph_text: The term ``collective bargaining ''was first used in 1891 by Beatrice Webb, a founder of the field of industrial relations in Britain. It refers to the sort of collective negotiations and agreements that had existed since the rise of trade unions during the 18th century.

paragraph_text: Pearl Lake State Park, at the base of Hahn's Peak, is in Routt County, Colorado near the town of Hahn's Peak, Colorado and is north of Steamboat Springs. Pearl Lake is named for M. Pearl Hartt, the wife of pioneer sheep rancher, John Kelly Hartt.

paragraph_text: Carroll was traded to the New Jersey Nets for the 1988–89 season, where he averaged 14.1 points a game and shot 80 percent from the free throw line. He was traded in the middle of the 1989–90 season to the Denver Nuggets for Michael Cutright on February 21, 1990, where he averaged 10 points a game and appeared in the first round of the 1990 NBA Playoffs, losing to the San Antonio Spurs. Joe Barry Carroll played his last NBA season for the Phoenix Suns. Only playing in 11 games and averaging 3.4 points, he shot a career high .917 percent from the line.

paragraph_text: 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.

paragraph_text: From its base in India, the Company had also been engaged in an increasingly profitable opium export trade to China since the 1730s. This trade, illegal since it was outlawed by the Qing dynasty in 1729, helped reverse the trade imbalances resulting from the British imports of tea, which saw large outflows of silver from Britain to China. In 1839, the confiscation by the Chinese authorities at Canton of 20,000 chests of opium led Britain to attack China in the First Opium War, and resulted in the seizure by Britain of Hong Kong Island, at that time a minor settlement.

paragraph_text: The American Federation of Labor (AFL) organized as an association of trade unions in 1886. The organization emerged from a dispute with the Knights of Labor (K of L) organization, in which the leadership of that organization solicited locals of various craft unions to withdraw from their International organizations and to affiliate with the K of L directly, an action which would have taken funds from the various unions and enriched the K of L's coffers. The Federation of Organized Trades and Labor Unions also merged into what would become the American Federation of Labor.

paragraph_text: Between 1815 and 1914, a period referred to as Britain's ``imperial century ''by some historians, around 10,000,000 square miles (26,000,000 km) of territory and roughly 400 million people were added to the British Empire. Victory over Napoleon left Britain without any serious international rival, other than Russia in Central Asia. Unchallenged at sea, Britain adopted the role of global policeman, a state of affairs later known as the Pax Britannica, and a foreign policy of`` splendid isolation''. Alongside the formal control it exerted over its own colonies, Britain's dominant position in world trade meant that it effectively controlled the economies of many countries, such as China, Argentina and Siam, which has been described by some historians as an ``Informal Empire ''.

paragraph_text: Simao District (; formerly known as Cuiyun District) is a district under the jurisdiction of Pu'er City, Yunnan Province, China. It is the seat of Puer Prefecture. Formerly both Simao and the surrounding region of Pu'er prefecture played a major role in the historic tea horse trade between Yunnan, Tibet and India, with Simao acting as the southern terminus or starting point for the transport of tea by mule caravan north to Dali, Lijiang and Lhasa. Tea remains a central crop and product of the region.

paragraph_text: The Point Pleasant Rail Bridge is a cantilever bridge that crosses the Ohio River between Gallia County, Ohio and Point Pleasant, West Virginia. At the present time, the bridge is being used by the Kanawha River Railroad for transporting goods from point to point via rail, but it was once used by Norfolk Southern, Conrail, Penn Central, and the New York Central Railroad.

paragraph_text: At the concluding Treaty of Utrecht, Philip renounced his and his descendants' right to the French throne and Spain lost its empire in Europe. The British Empire was territorially enlarged: from France, Britain gained Newfoundland and Acadia, and from Spain, Gibraltar and Minorca. Gibraltar became a critical naval base and allowed Britain to control the Atlantic entry and exit point to the Mediterranean. Spain also ceded the rights to the lucrative asiento (permission to sell slaves in Spanish America) to Britain.

paragraph_text: There have been a total of 984 individual matches played in the 42 Ryder Cups. Of these the United States has won 475, Europe (including Great Britain / Great Britain and Ireland up to 1977) has won 375 with 134 matches halved. Thus the United States have scored a total of 542 points to Europe's 442.

Question: When did Britain withdraw from the place which was the central point of pearl trading?
Answer: 1971