The greater part of the country is mountainous. Its principal ranges are the Tien Shan, the Kunlun chain, and the Trans-Himalaya. In the southwest is Tibet, which China annexed in 1950. The Gobi Desert lies to the north. China proper consists of three great river systems: the Yellow River (Huang He), 2,109 mi (5,464 km) long; the Yangtze River (Chang Jiang), the third-longest river in the world at 2,432 mi (6,300 km); and the Pearl River (Zhu Jiang), 848 mi (2,197 km) long.

Government   Communist state.

The earliest recorded human settlements in what is today called China were discovered in the Huang He basin and date from about 5000 B.C. During the Shang dynasty (1500–1000 B.C.), the precursor of modern China's ideographic writing system developed, allowing the emerging feudal states of the era to achieve an advanced stage of civilization, rivaling in sophistication anything found at the time in Europe, the Middle East, or the Americas. It was following this initial flourishing of civilization, in a period known as the Chou dynasty (1122–249 B.C.), that Lao-tse, Confucius, Mo Ti, and Mencius laid the foundation of Chinese philosophical thought.

The feudal states, often at war with one another, were first united under Emperor Ch'in Shih Huang Ti, during whose reign (246–210 B.C.) work was begun on the Great Wall of China, a monumental bulwark against invasion from the West. Although the Great Wall symbolized China's desire to protect itself from the outside world, under the Han dynasty (206 B.C.–A.D. 220), the civilization conducted extensive commercial trading with the West.

In the T'ang dynasty (618–907)—often called the golden age of Chinese history—painting, sculpture, and poetry flourished, and woodblock printing, which enabled the mass production of books, made its earliest known appearance. The Mings, last of the native rulers (1368–1644), overthrew the Mongol, or Yuan, dynasty (1271–1368) established by Kublai Khan. The Mings in turn were overthrown in 1644 by invaders from the north, the Manchus.

China remained largely isolated from the rest of the world's civilizations, closely restricting foreign activities. By the end of the 18th century only Canton (location of modern-day Hong Kong) and the Portuguese port of Macao were open to European merchants. But with the first Anglo-Chinese War in 1839–1842, a long period of instability and concessions to Western colonial powers began. Following the war, several ports were opened up for trading, and Hong Kong was ceded to Britain. Treaties signed after further hostilities (1856–1860) weakened Chinese sovereignty and gave foreigners immunity from Chinese jurisdiction. European powers took advantage of the disastrous Sino-Japanese War of 1894–1895 to gain further trading concessions from China. Peking's response, the Boxer Rebellion (1900), was suppressed by an international force.

The death of Empress Dowager Tzu Hsi in 1908 and the accession of the infant emperor Hsüan T'ung (Pu-Yi) were followed by a nationwide rebellion led by Dr. Sun Yat-sen, who overthrew the Manchus and became the first president of the Provisional Chinese Republic in 1911. Dr. Sun resigned in favor of Yuan Shih-k'ai, who suppressed the Republicans in a bid to consolidate his power. Yuan's death in June 1916 was followed by years of civil war between rival militarists and Dr. Sun's Republicans. Nationalist forces, led by General Chiang Kai-shek and with the advice of Communist experts, soon occupied most of China, setting up a Kuomintang regime in 1928. Internal strife continued, however, and Chiang eventually broke with the Communists.

On Sept. 18, 1931, Japan launched an invasion of Manchuria, capturing the province. Tokyo set up a puppet state dubbed Manchukuo and installed the last Manchu emperor, Henry Pu-Yi (Hsüan T'ung), as its nominal leader. Japanese troops moved to seize China's northern provinces in July 1937 but were resisted by Chiang, who had been able to use the Japanese invasion to unite most of China behind him. Within two years, however, Japan had seized most of the nation's eastern ports and railways. The Kuomintang government retreated first to Hankow and then to Chungking, while the Japanese set up a puppet government at Nanking, headed by Wang Jingwei.

Japan's surrender to the Western Allies in 1945 touched off civil war between the Kuomintang forces under Chiang and Communists led by Mao Zedong, who had been battling since the 1930s for control of China. Despite U.S. aid, the Kuomintang were overcome by the Soviet-supported Communists, and Chiang and his followers were forced to flee the mainland, establishing a government-in-exile on the island of Formosa (Taiwan). The Mao regime proclaimed the People's Republic of China on Oct. 1, 1949, with Beijing as the new capital and Zhou Enlai as premier.

After the Korean War began in June 1950, China led the Communist bloc in supporting North Korea, and on Nov. 26, 1950, the Mao regime sent troops to assist the North in its efforts to capture the South.

In an attempt to restructure China's primarily agrarian economy, Mao undertook the “Great Leap Forward” campaign in 1958, a disastrous program that aimed to combine the establishment of rural communes with a crash program of village industrialization. The Great Leap forced the abandonment of farming activities, leading to widespread famine in which more than 20 million people died of malnutrition.

In 1959, a failed uprising against China's invasion and occupation of Tibet forced Tibetan Buddhism's spiritual leader, the Dalai Lama, and 100,000 of his followers to flee to India. The invasion of Tibet and a perceived rivalry for the leadership of the world Communist movement caused a serious souring of relations between China and the USSR, former allies. In 1965 Tibet was formally made an autonomous region of China. China's harsh religious and cultural persecution of Tibetans, which continues to this day, has spawned growing international protest.

The failure of the Great Leap Forward touched off a power struggle within the Chinese Communist Party between Mao and his supporters and a reformist faction including future premier Deng Xiaoping. Mao moved to Shanghai, and from that base he and his supporters waged what they called the Cultural Revolution. Beginning in the spring of 1966, Mao ordered the closing of schools and the formation of ideologically pure Red Guard units, dominated by youths and students. The Red Guards campaigned against “old ideas, old culture, old habits, and old customs.” Millions died as a series of violent purges were carried out. By early 1967, the Cultural Revolution had succeeded in bolstering Mao's position as China's paramount leader.

Anxious to exploit the Sino-Soviet rift, the Nixon administration made a dramatic announcement in July 1971 that National Security Adviser Henry Kissinger had secretly visited Beijing and reached an agreement whereby Nixon would visit China. The movement toward reconciliation, which signaled the end of the U.S. containment policy toward China, provided momentum for China's admission to the UN. Despite U.S. opposition to expelling Taiwan (Nationalist China), the world body overwhelmingly voted to oust Taiwan in favor of Beijing's Communist government.

President Nixon went to Beijing for a week early in 1972, meeting Mao as well as Zhou. The summit ended with a historic communiqué on Feb. 28, in which both nations promised to work toward improved relations. Full diplomatic relations were barred by China as long as the U.S. continued to recognize the legitimacy of Nationalist China.

Following Zhou's death on Jan. 8, 1976, his successor, Vice Premier Deng Xiaoping, was supplanted within a month by Hua Guofeng, former minister of public security. Hua became permanent premier in April. In Oct. he was named successor to Mao as chairman of the Communist Party. But Mao's death on Sept. 10 unleashed the bitter intraparty rivalries that had been suppressed since the Cultural Revolution. Old opponents of Mao launched a campaign against his widow, Jiang Qing, and three of her “radical” colleagues. The so-called Gang of Four was denounced for having undermined the party, the government, and the economy. They were tried and convicted in 1981. Meanwhile, in 1977, Deng Xiaoping was reinstated as deputy premier, chief of staff of the army, and member of the Central Committee of the Politburo.

Beijing and Washington announced full diplomatic relations on Jan. 1, 1979, and the Carter administration abrogated the Taiwan defense treaty. Deputy Premier Deng sealed the agreement with a visit to the U.S. that coincided with the opening of embassies in both capitals on March 1. On Deng's return from the U.S., Chinese troops invaded and briefly occupied an area along Vietnam's northern border. The action was seen as a response to Vietnam's invasion of Cambodia and ouster of the Khmer Rouge government, which China had supported.

In 1981, Deng protégé Hu Yaobang replaced Hua Guofeng as party chairman. Deng became chairman of the committee's military commission, giving him control over the army. The body's 215 members concluded the session with a statement holding Mao Zedong responsible for the “grave blunder” of the Cultural Revolution.

Under Deng Xiaoping's leadership, meanwhile, China's Communist ideology went through a massive reinterpretation, and sweeping economic changes were set in motion in the early 1980s. The Chinese scrapped the personality cult that idolized Mao Zedong, muted Mao's old call for class struggle and exportation of the Communist revolution, and imported Western technology and management techniques to replace the Marxist tenets that had slowed modernization. Deng concluded an agreement for the return of Hong Kong following the expiration of Britain's 99-year lease on the territory on July 1, 1997.

The removal of Hu Yaobang as party chairman in Jan. 1987 signaled a hard-line resurgence within the party. Hu—who had become a hero to many reform-minded Chinese—was replaced by former premier Zhao Ziyang. With the death of Hu in April 1989, the ideological struggle spilled into the streets of the capital, as student demonstrators occupied Beijing's Tiananmen Square in May, calling for democratic reforms. Less than a month later, the demonstrations were crushed in a bloody crackdown as troops and tanks moved into the square and fired on protesters, killing several hundred.

In annual sessions of the rubber-stamp National People's Congress in 1992 and 1993, the government called for accelerating the drive for economic reform, but the sessions were widely seen as an effort to maintain China's moves toward a market economy while retaining political authoritarianism. At the session in 1993, Communist Party leader Jiang Zemin was elected president, while hard-liner Li Peng was reelected to another five-year term as prime minister. Since 1993, the Chinese economy has continued to grow rapidly.

Deng Xiaoping's death in Feb. 1997 left a younger generation in charge of managing the enormous country. In 1998, Prime Minister Zhu Rongji introduced a sweeping program to privatize state-run businesses and further liberalize the nation's economy, a move lauded by Western economists.

On July 1, 1997, when Britain's lease on the New Territories expired, Hong Kong returned to Chinese sovereignty, and in 1999, the Portuguese colony of Macao also was returned to Chinese rule.

In Aug. 1999, China rounded up thousands of members of the Falun Gong sect, a highly popular religious movement that combines elements of Buddhism, Taoism, and martial arts. China, which has now outlawed the sect, was thought to consider the apolitical spiritual group threatening because its numbers exceeded the membership of the Chinese Communist Party.

China was admitted to the World Trade Organization in Nov. 2001. Its entry ended a 15-year debate over whether China is entitled to the full trading rights of capitalist countries.

In Nov. 2002, Vice President Hu Jintao became general secretary of the Communist Party at the 16th Party Congress, succeeding President Jiang. But Jiang retained various positions of power, including head of the Central Military Commission, and filled the Politburo Standing Committee with his protégés. Jiang thus positioned himself to rule as éminence grise for the next several years. Hu Jintao assumed the presidency in March 2003.

The World Health Organization labeled severe acute respiratory syndrome (SARS) a “worldwide health threat” in March 2003. After coming under fire by the WHO for underreporting the number of its SARS cases, China finally revealed the alarming extent of its epidemic.

China became the third country (after Russia and the U.S.) to launch a person into space in Oct. 2003, when Yang Liwei orbited the Earth 14 times aboard the Shenzhou V spacecraft.

Beijing officials angered democracy advocates in Hong Kong in April 2004, when they banned popular elections for Hong Kong's chief executive, scheduled for 2007.

On Sept. 24, 2004, former president Jiang Zemin stepped down as China's military chief, thus completing the transfer of power to President Hu that had begun nearly two years earlier.

Tension between China and Taiwan intensified in March 2005, when China passed an anti-secession law that said the country could use force if Taiwan moved toward achieving independence. “The state shall employ non-peaceful means and other necessary measures to protect China's sovereignty and territorial integrity,” the legislation said. Taiwan president Chen Shui-bian called the bill a “law of aggression.”

Lien Chan, who heads Taiwan's opposition Nationalist Party, traveled China in April and met with President Hu. It was the first meeting between Nationalist and Communist Party leaders since 1949, when the defeated Nationalists retreated to Taiwan. Lien called the visit a “journey of peace.” In May, Hu met with another Taiwanese opposition leader, James Soong, chairman of the People First Party. In a joint communiqué intended to restart negotiations between Taiwan and China, they agreed to a principle of “two sides of the strait, one China.”

At an April meeting in India, Wen and Indian prime minister Manmohan Singh promised to end a four-decade dispute over border territory. They also agreed to increase trade between the two countries, the world's most populous.

Relations between China and Japan reached new lows in April, when the Chinese government condoned a series of anti-Japanese protests, sparked by the release of new Japanese textbooks that whitewashed the atrocities committed by Japan during World War II. After three weeks of demonstrations, the Chinese government ordered an end to the protests. Japanese prime minister Junichiro Koizumi apologized for Japan's abuses, saying, “Japan, through its colonial rule and aggression, caused tremendous damage and suffering to the people of many countries, particularly to those of Asian nations.”

Relations further deteriorated in May, when Wu Yi, China's vice-premier, shunned Japanese prime minister Junichiro Koizumi during a brief visit to Japan that was intended to mend relations. Chinese officials said she canceled their planned meeting to protest laudatory comments about the Yasukuni shrine made by Japanese officials. The shrine, which honors some of Japan's most notorious war criminals, has been a constant source animosity between the countries.

In June 2005, the China National Oil Corporation bid $18.5 billion to take over U.S. oil company Unocal. Several U.S. congressmen expressed concern that national security could be compromised if the transaction goes through.

After months of pressure from the Bush administration, China announced in July that it will no longer peg the yuan to the dollar. Instead, it is linked to a fluctuating group of foreign currencies.