The unequal treaties were a series of agreements made between East Asian countries—most notably Qing China, Tokugawa Japan (in the 1850s) and Joseon Korea—and imperial powers—most notably the United Kingdom, France, Germany, Austria-Hungary, the Empire of Japan (starting in the late 1870s), Italy, Portugal, the United States and Russia—during the 19th and early 20th centuries. They were often signed following a military defeat suffered by the Asian party, or amid military threats made by the Western powers. The terms specified obligations to be borne almost exclusively by the Asian party and included provisions such as the cession of territory, payment of reparations, opening of treaty ports, relinquishment of the right to control tariffs and imports, and granting of extraterritoriality to foreign citizens.
With the rise of Chinese nationalism and anti-imperialism in the 1920s, both the Kuomintang (KMT) and the Chinese Communist Party (CCP) used the concept to characterize the Chinese experience of losing sovereignty between roughly 1840 to 1950. The term "unequal treaty" became associated with the concept of China's "century of humiliation", especially the concessions to foreign powers and the loss of tariff autonomy through treaty ports, and continues to serve as a major impetus for the foreign policy of China today.
Japan and Korea also use the term to refer to several treaties that resulted in a reduction of their national sovereignty. Japan and China signed treaties with Korea such as the Japan–Korea Treaty of 1876 and China–Korea Treaty of 1882, with each granting privileges to the former parties concerning Korea. Japan after the Meiji Restoration also began enforcing unequal treaties against China after its victory in the First Sino-Japanese War for influence over Korea as well as China's coastal ports and territories.
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Japan
Prior to the Meiji Restoration, Japan was also subject to numerous unequal treaties. When the US expeditionary fleet led by Matthew Perry reached Japan in 1854 to force open the island nation for American trade, the country was compelled to sign the Convention of Kanagawa under the threat of violence by the American warships. This event abruptly terminated Japan's 220 years of seclusion under the Sakoku policy of 1633 under unilateral foreign pressure and consequentially, the convention has been seen in a similar light as an unequal treaty.
Another significant incident was the Tokugawa Shogunate's capitulation to the Harris Treaty of 1858, negotiated by the eponymous U.S. envoy Townsend Harris, which, among other concessions, established a system of extraterritoriality for foreign residents. This agreement would then serve as a model for similar treaties to be further signed by Japan with other foreign Western powers in the weeks to follow, such as the Ansei Treaties, which forcefully opened five Japanese ports, established extraterritoriality for foreigners and set fixed, low tariffs for Japan, which caused significant economic disruption and political outrage in Japan.
Unequal treaties with the United States and Europe also prevented Japan from unilaterally setting tariff rates on imported goods. As a result, it was hampered in developing domestic industries that could compete with imported goods.
The enforcement of these unequal treaties were a tremendous national shock for Japan's leadership as they both curtailed Japanese sovereignty for the first time in its history and also revealed the nation's growing weakness relative to the West through the latter's successful imposition of such agreements upon the island nation. An objective towards the recovery of national status and strength would become an overarching priority for Japan, with the treaty's domestic consequences being the end of the Bakufu and its 700 years of shogunate rule over Japan in 1868, and the establishment of a new imperial government known as the Empire of Japan.
The unequal treaties ended at various times for the countries involved and Japan's victories in the 1894–95 First Sino-Japanese War convinced many in the West that unequal treaties could no longer be enforced on Japan as it was a great power in its own right. The Anglo-Japanese Treaty of Commerce and Navigation in 1894, negotiated by Foreign Minister Mutsu Munemitsu, was the first successful move toward eliminating extraterritoriality which was fully achieved in 1899. This view gained more recognition following the Russo-Japanese War in 1905, whereby Japan most notably defeated Russia in a massive humiliation for the latter.
Korea
Korea's first unequal treaty was not with the West, but instead with Japan. The Ganghwa Island incident in 1875 saw Japan send the warship Un'yō led by Captain Inoue Yoshika with the implied threat of military action to coerce the Korean kingdom of Joseon through the show of force. After an armed clash ensued around Ganghwa Island where the Japanese force was sent, which resulted in its victory, the incident subsequently forced Korea to open its doors to Japan by signing the Treaty of Ganghwa Island, also known as the Japan–Korea Treaty of 1876.
During this period Korea also signed treaties with Qing China and the West powers (such as the United Kingdom and the United States). In the case of Qing China, it signed the China–Korea Treaty of 1882 with Korea stipulating that Korea was a dependency of China and granted the Chinese extraterritoriality and other privileges, and in subsequent treaties China also obtained concessions in Korea, such as the Chinese concession of Incheon. However, Qing China lost its influence over Korea following the First Sino-Japanese War in 1895.
As Japanese dominance over the Korean peninsula grew in the following decades, it imposed more unequal treaties, beginning with the 1882 Treaty of Chemulpo, which allowed Japan to station troops in Korea following the Imo Incident. with respect to the unequal treaties imposed upon the kingdom by the Western powers (1882 Shufeldt Treaty), Korea's diplomatic concessions with those states became largely null and void by 1910, when it was annexed by Japan.