[The Korean] Choson Dynasty suffered from... large-scale revolts of the masses in the northwest (1811-12) and southwest (1862 and 1894-95).
...The revolt of 1894-95, known as the Tonghak Rebellion, had international repercussions. Like the Taiping rebels in China thirty years earlier, the Tonghak [Literally, Eastern learning, an indigenous religious movement founded by Ch'oe Che-u in the early 1860s...] participants were fired by religious fervor as well as by indignation about the corrupt and oppressive government. The rebellion spread from the southwest to the central region of the peninsula, menacing Seoul. The Korean court apparently felt unable to cope with the rebels and invited China to send troops to quell the rebellion. This move gave Japan a pretext to dispatch troops to Korea. The two countries soon engaged in the First Sino-Japanese War (1894-95), which accelerated the demise of the Qing Dynasty in China.