From Imperial Twilight: The Opium War and the End of China’s Last Golden Age, by Stephen R. Platt (Knopf, 2018), Kindle pp. 302-304:
Conditions in China were getting worse under Daoguang’s reign. By the time he took the throne, and to some degree beginning even with his father, Jiaqing, it becomes easier to speak of the empire each sovereign inherited rather than what he created or built. They, and the emperors and regents to follow, would have their successes—the dynasty would, after all, survive into the early twentieth century—but rarely did they leave China in a more solid position than they had found it. By the early nineteenth century, an inexorable process of decline was setting in, the slow setting of a sun that had reached its zenith under Qianlong in the late 1700s. Jiaqing had done his best, making strong efforts to rein in the corruption of the military and suppress the White Lotus and other rebellions. But under the rule of his son Daoguang, new problems would plague the empire even as old ones kept coming back in different forms.
Patronage, bribery, and embezzlement were the accepted norm among civil officials, especially in the lower orders. Population pressures on the land continued unabated, and Han Chinese settlers seeking an escape from the crowding continued to move into mountainous regions of the empire that had long been home to indigenous peoples, sparking incidents of ethnic violence. A breakdown of trust between the government and peasants worsened. The military was weakened by Jiaqing’s cost-cutting measures after the White Lotus campaigns. Through the 1830s, internal rebellions erupted in different parts of the empire with regularity, every year or two—some led by religious sects similar to the White Lotus, others by rebel factions bonded together by regional or ethnic ties. The many divisions that ran naturally through a vast and diverse multiethnic empire were turning more frequently and more visibly into fractures.
Opium wove its way right through the tattering fabric of this restive society, the single most visible symbol of the Chinese government’s inability to control its people. In spite of Daoguang’s strong desire to control the drug, coastal enforcements on smuggling had failed so completely that by the later 1830s when a foreign ship materialized near the coast it would find not naval patrols but thousands of buyers standing along the shore and whistling to it in hopes that it would drop anchor and sell to them. A major north–south land transport route for opium through Hunan province formed the locus of a series of uprisings that took place in central China in 1836, and imperial troops transferred inland to pacify them turned out to be such heavy users of opium themselves that they could barely fight. Ironically, they had acquired their drug habits in the course of their previous mission, which was to police the smugglers on the coast near Canton.
China’s rising domestic unrest caught the attention of foreigners in Canton, who worried about damage to tea and silk production from the disturbances in the interior. However, some of them also sensed opportunity in the ones that took place on China’s periphery. In 1833, an explosive revolt of aborigines on Taiwan threatened Qing imperial control of the island for several months, in the midst of which it was announced in Britain’s parliament that Taiwan had “declared its independence of the Chinese.” Some foreigners had already begun touting Taiwan as a potential British colony, a base from which they could conduct their trade with China free from the restrictions of Canton. They argued that, morally speaking, to take control of Taiwan would be nothing like trying to seize territory on the Chinese mainland, because Taiwan had been a Dutch possession prior to its conquest by Qianlong’s grandfather Kangxi, so they judged it to be merely a colony of the Qing Empire rather than essential Chinese territory. According to one Canton English-language newspaper, the Taiwanese were a conquered people, “vassals of China; not willingly, but in consequence of bloody wars,” and so even foreigners who opposed aggression toward China shouldn’t object to the British taking control of the island, which the paper judged would be praiseworthy even if only for the sake of “ridding its people of the tyranny of the Chinese.”