Title: Chinese expansionism
Content:  Under the Qing rule, China expanded beyond the Great Wall and started to annex more territories in process. The Qing invaded Korea, managed to conquer Mongolia, and also annexed modern territories of Xinjiang and Tibet as well. The Qing also managed to extend its control into Central Asia for once more, mostly concentrated in what would be today Kazakhstan, Kyrgyzstan and Tajikistan. The Qing also destroyed the Kingdom of Tungning of Koxinga, and annexed Taiwan as well. This marked for the first time, China managed to directly control Xinjiang, Taiwan, Tibet, Central Asia and Mongolia. China also marked its claims far to Sakhalin, even though the Qing didn't manage 
Title: Chinese irredentism
Content:  The Qing dynasty inaugurated a new age in Chinese expansionism. The Qing invaded the Joseon dynasty and incorporated it into its tributary system. Outer Mongolia, Tibet and Xinjiang were incorporated into China following decades of territorial expansion. The Qing dynasty also extended its control into Central Asia and annexed Taiwan, which was previously controlled by the Ming loyalist Kingdom of Tungning. However, the Qing dynasty had little success in its campaigns against Burma, Vietnam, and Nepal. Qing expansionism stopped following its defeat in the First Opium War which marked the start of the "century of humiliation".
Title: Chinese expansionism
Content:  The Qing dynasty was a Manchu-ruled dynasty, descended from the Jurchens which founded the Jin dynasty earlier. The dynasty embraced Chinese expansionism. By the late 19th century, in response to competition with other states, the Qing government of China attempted to exert direct control of its frontier areas by conquest or, if already under military control, conversion into provinces. The ability of Qing China to project power into Central Asia came about because of two changes, one social and one technological. The social change was that under the Qing dynasty, from 1642, the Chinese military forces were organized around cavalry which was more suited for power projection than prior Chinese 
Title: Qing dynasty
Content:  Qing China reached its largest extent during the 18th century, when it ruled China proper (eighteen provinces) as well as the areas of present-day Northeast China, Inner Mongolia, Outer Mongolia, Xinjiang and Tibet, at approximately 13 million km2 in size. There were originally 18 provinces, all of which in China proper, but later this number was increased to 22, with Manchuria and Xinjiang being divided or turned into provinces. Taiwan, originally part of Fujian province, became a province of its own in the 19th century, but was ceded to the Empire of Japan following the First Sino-Japanese War in 1895.
Title: Chinese expansionism
Content:  Historically, China has been a major empire in history, and throughout its history, China developed from the northern basin of the Huaxia, which is believed to be between modern Yellow and Yangtze rivers, slowly became a major power from ancient era. To achieve that, various ethnic Han Chinese dynasties had perpetuated the expansions of the nation, until it was unified under the Qin dynasty. However, it was only the Qin dynasty that China truly started its process of expansion into other nations. Qin dynasty's expansionism eventually led to its first contacts with the ancient Yue tribes, and further extended to ancient Koreans, 
Title: Qing dynasty in Inner Asia
Content:   The Qing dynasty in Inner Asia was the expansion of the Qing dynasty's realm in Inner Asia in the 17th and the 18th century AD, including both Inner and Outer Mongolia, Manchuria, Tibet, Qinghai and Xinjiang. Wars were fought primarily against the Northern Yuan dynasty (before 1636) and the Dzungar Khanate (1687–1758). Even before the conquest of China proper (see Transition from Ming to Qing), the Manchus had established the Later Jin dynasty that controlled Manchuria (modern Northeast China as well as Outer Manchuria) and Inner Mongolia, with the latter being previously controlled by the Northern Yuan dynasty under Ligdan Khan. After suppressing the Revolt of the 
Title: Chinese expansionism
Content:  well as the Xiongnus. The Qin dynasty laid the foundation for future territorial expansions by subsequent Chinese dynasties. The Han dynasty marked the height of early Chinese expansionism. Under the Han dynasty, China managed to conquer northern Korea and northern Vietnam, annexing several parts of these territories in the process. The Han dynasty also managed to expel several nomad tribes and gained control, for sometimes, over what would be modern Xinjiang, though it was mostly symbolic due to unsuitable climate situation and internal turmoil within. Following the fall of the Han dynasty, Korea was set free of China, leaving only northern Vietnam 
Title: History of China
Content:  The Qing dynasty (1644–1912) was the last imperial dynasty in China. Founded by the Manchus, it was the second conquest dynasty to rule the entirety of China proper, and roughly doubled the territory controlled by the Ming. The Manchus were formerly known as Jurchens, residing in the northeastern part of the Ming territory outside the Great Wall. They emerged as the major threat to the late Ming dynasty after Nurhaci united all Jurchen tribes and his son, Hong Taiji, declared the founding of the Qing dynasty in 1636. The Qing dynasty set up the Eight Banners system that provided the basic framework for the Qing military conquest. Li Zicheng's 
Title: Amur campaign
Content:  The recently created Qing dynasty under Hong Taiji expanded rapidly during the 1630s in all directions. One of the areas which came under attack by Qing expansionism was the northeast Amur river region where people such as the Evenks, Nanai, Daur, and Solon lived.
Title: Chinese expansionism
Content:  The establishment of the Tang dynasty marked the comeback of Chinese expansionism, where it was also considered as the height of China as an ancient superpower. Under the Tang dynasty, China managed to maintain control over northern Vietnam, and returned to Korea. The Chinese Empire also managed to extend its control over Xinjiang and Central Asia, reaching as far west as the Aral Sea and Caspian Sea,  although its rule over frontier regions was not consolidated, as China sought to gain loyalty from the Turkic and Sogdian tribes. At least, for once, the Chinese Empire managed to enroach into the Tibetan territory and occupied Lhasa, until they had to abandon due to difficult climate. 

Question: who expanded the territory of china during the qing dynasty?
Answer: Qianlong.
the Qianlong Emperor.
Prince Bao.