The rise of the Qing (Manchu) dynasty, which had such profound effects on the fate of Mongolia, began long before 1644, the year a Manchu emperor was first seated on the throne in Beijing. In the late 16th century it was becoming clear that a new barbarian conquest of China was again possible. In competition with the various Mongol princes and tribes already mentioned, the Manchu had the advantage that in the southern part of northeastern China (Manchuria), but outside the Great Wall, there was a large Chinese population with a number of urban centres and a flourishing trade that, instead of passing by land through the Great Wall, went largely by sea to the Shandong Peninsula—to the rear, that is, of the rulers in Beijing. These Chinese were somewhat alienated from other Chinese. They had for centuries been accustomed to trading with the barbarians and to farming under the patronage of barbarian princes, and they did not like Beijing’s periodic attempts to maintain a “closed frontier” along the Great Wall.

The Manchu not only subjugated these Chinese but also cultivated their loyalty and were soon heavily dependent on them, not only economically but for military manpower. To balance this dependence, they built up a network of alliances with their other neighbours, the easternmost Mongols, and Mongol troops took part in the Manchu conquest of China. Before the Manchu occupied Beijing, they established control of the southern fringe of Mongolia, which they organized as part of their military reserve for the domination of China. This organization is the origin of the institutional and administrative concept of “Inner” Mongolia. It took the Manchu about a century to add northern, or “Outer,” Mongolia to their empire, resulting in two Mongolias markedly different from each other, Inner Mongolia being much more closely integrated with China.

Meanwhile, the Oirat (Jungar) made a belated effort to unite all the Mongols in rivalry with the Manchu. The Oirat were strengthened by their control of a number of the East Turkistan oases but weakened by rivalries among their chiefs, by the diversion of much of their strength to adventures in Tibet, and by the reluctance of the Khalkh princes to accept the overlordship of princes not descended from Genghis Khan. Led by such warriors as Galdan (Dga’-ldan), the Oirat made sweeping campaigns far to the east in Mongolia but were never quite able to consolidate their gains.

Unwilling to accept submission to the Oirat as the price of unification, the Khalkh princes rallied more and more to the Manchu, who guaranteed their aristocratic privileges and titles in a great convention at Dolon Nor (Duolun), Inner Mongolia, in 1691. With the added resources of Khalkh, the Manchu were then able to mount a long series of military campaigns in which they annihilated the Oirat power with tremendous slaughter.

This conquest was not completed until 1759, however, and it was complicated by many events, particularly a major revolt against Manchu rule in western Khalkh in the 1750s led by a noble named Chingünjav. He was a coconspirator with an Oirat leader named Amursanaa, who in turn had first submitted to the Manchu and then rebelled against them. This was the last period of general warfare involving the Mongols, and it ended with a considerable redistribution of the tribes; several Khalkh groups that had fled from the Oirat into Inner Mongolia never returned; a few Chahar from Inner Mongolia were settled in East Turkistan as garrisons; numbers of the Oirat group were included in the western part of Khalkha geographically but not within the tribal organization; some ended their migrations at the Alxa Plateau (Ala Shan Desert), at the western end of Inner Mongolia, but not within the Inner Mongolian organization; and some ended theirs far away in the Koko Nor–Qaidam Basin region of Tibet. The most distant Oirat wanderers (mostly Torguud and Dörvöd) had migrated in the early 17th century from the Altai Mountains to the Volga River, where they took service under the tsars and participated in the Russian conquest of the Caucasus region. In 1771 about 70,000 families migrated all the way back to East Turkistan—which by then had been renamed Xinjiang (“New Frontier”) by the Manchu—where they were accepted under Manchu rule and allotted pastures for grazing. The descendants of those who remained on the Volga were known as the Kalmyk (Kalmuck).

The ensuing period of peace degenerated into stagnation and economic decline. Chinese camp followers had accompanied the Manchu conquest, and from this grew Chinese control of the caravan trade and of a barter trade exploiting usurious terms of credit. Because Mongol troops were of decreasing use for the control of China, there was no incentive for the Manchu to protect, economically, this source of manpower, and the Manchu authorities relied increasingly on the potentates of Tibetan Buddhism, who were themselves increasingly corrupt, for the control of Mongolia. Chinese colonization began to encroach on the pasturelands of Inner Mongolia, and at the end of the 19th century an attempt was made to plant a screen of Chinese colonists along the frontier between Siberia and Outer Mongolia.

Mongolia from 1900 to 1990

At the turn of the 20th century, Japan and Russia were competing to expand their empires into northeastern Asia at the expense of the Qing (Manchu) rulers in China. Russia had encroached southward into northern Manchuria. Meanwhile, Japan had fought and won the Sino-Japanese War of 1894–95 and had demanded that China cede the Liaodong Peninsula and its strategically important harbours of Dalian (Dairen) and Port Arthur (Lüshun; now part of Dalian) on the Chinese coast. However, the Western powers intervened, and in 1898 Russia negotiated a 25-year lease of the peninsula with China, much to the anger of Japan. In the ensuing Russo-Japanese War (1904–05), Japan prevailed, and Russia ceded to Japan all its interests in northeastern China. In addition, by secret treaties concluded after the war, Inner Mongolia east of the meridian of Beijing was recognized by Russia as a Japanese sphere of interest.

Meanwhile, the British, concerned about a possible Russian threat to India through Tibet, which the Manchu could not control, sent an expeditionary force under Francis Younghusband to Lhasa. In 1904 the Dalai Lama fled Lhasa and took refuge in Urga (now Ulaanbaatar) with the Javzandamba khutagt (Mongolia’s spiritual leader) for nearly two years. The agreement signed between Britain and Tibet in 1904 presented Tibet as an independent state and made no reference to Qing rule, although the Manchu amban (governor) was present at the signing. However, in 1907 the Qing negotiated their own treaty with the British that recognized Chinese suzerainty in Tibet. In 1910 Chinese troops entered Lhasa, and the Dalai Lama again fled, though this time to India, returning in 1912. In a treaty signed at Niislel Khüree (now Ulaanbaatar) in January 1913, Tibet and Mongolia declared themselves both to be free from Manchu rule and separate from China, and they pledged to cooperate as sovereign states.