Tributary system of China in the context of "Chinese cultural sphere"

The Sinosphere, also known as the Chinese cultural sphere, East Asian cultural sphere, or the Sinic world, encompasses multiple countries in East Asia and Southeast Asia that were historically heavily influenced by Chinese culture. The Sinosphere comprises Greater China, Japan, Korea, Vietnam and historically the Ryukyuans. Other definitions may include the regions of modern-day Mongolia and Singapore, due either to historical Chinese influence or a contemporary overseas Chinese population. The Sinosphere is different from the Sinophone world, which indicates regions where the Chinese language is spoken.

Imperial China was a major regional power in Eastern Asia and exerted influence on tributary states and neighboring states, including Japan, Korea, and Vietnam. These interactions brought ideological and cultural influences rooted in Confucianism, Buddhism, and Taoism. The four cultures were ruled by their respective emperors under similar imperial systems, furthermore, the adoption of the Confucian-based imperial examination system deeply influenced the bureaucracy and social structure of Korea and Vietnam. Chinese inventions influenced, and were in turn influenced by, innovations of the other cultures in governance, philosophy, science, and the arts. Literary Chinese became the written lingua franca for bureaucracy and communications, and Chinese characters became locally adapted as kanji in Japan, hanja in Korea, and chữ Hán in Vietnam.

Okinawa Prefecture (Japanese: 沖縄県, Hepburn: Okinawa-ken; pronounced [o.kʲi.na.wa(ꜜ.keɴ)]; Okinawan: 沖縄県, romanized: Uchinaachin) is the southernmost and westernmost prefecture of Japan. It consists of three main island groups—the Okinawa Islands, the Sakishima Islands, and the Daitō Islands—spread across a maritime zone approximately 1,000 kilometers east to west and 400 kilometers north to south. Despite a modest land area of 2,281 km (880 sq mi), Okinawa's territorial extent over surrounding seas makes its total area nearly half the combined size of Honshu, Shikoku, and Kyushu. Of its 160 islands, 49 are inhabited. The largest and most populous island is Okinawa Island, which hosts the capital city, Naha, as well as major urban centers such as Okinawa, Uruma, and Urasoe. The prefecture has a subtropical climate, characterized by warm temperatures and high rainfall throughout the year. People from the Nansei Islands, including Okinawa, the Sakishima Islands, and parts of Kagoshima Prefecture, are often collectively referred to as Ryukyuans. However, there are significant cultural and customary differences between individual islands and even between local communities.

Historically the center of the Ryukyu Kingdom, Okinawa long served as a maritime trading hub and cultural gateway; the kingdom participated in the Chinese tributary system—maintaining formal tribute relations with the Ming and Qing—and retained distinct statehood until it was incorporated into Japan as Okinawa Prefecture in 1879 following the Ryukyu Disposition. After the Battle of Okinawa (1945), the islands were under U.S. administration until reversion to Japan in 1972, and today host a large share of U.S. military facilities in Japan (around 70% by area of land exclusively used by U.S. forces), a continuing source of local and national debate. A small but persistent independence movement exists, reflecting Okinawa's distinct historical trajectory and identity.

The Treaty of Shimonoseki (Japanese: 下関条約, Hepburn: Shimonoseki Jōyaku), also known as the Treaty of Maguan in China or the Treaty of Bakan (馬關條約, Bakan Jōyaku) in Japan, was signed in Shimonoseki, Japan, on April 17, 1895, between the Empire of Japan and the Qing dynasty. The treaty ended the First Sino-Japanese War, in which the Japanese decisively defeated the Chinese land and naval forces. The treaty was signed at the Shunpanrō [ja] hotel by Count Itō Hirobumi and Viscount Mutsu Munemitsu for Japan and Li Hongzhang and his son Li Jingfang on behalf of China.

The peace conference took place from March 20 to April 17, 1895, and the treaty followed and superseded the Sino-Japanese Friendship and Trade Treaty of 1871. It consisted of 11 articles which provided for the termination of China's tributary relations with Korea; required that China pay an indemnity of 200 million taels and cede Taiwan (Formosa), the Penghu (Pescadores) Islands, and the Liaodong Peninsula to Japan; and opened four cities (Shashi, Chongqing, Suzhou, and Hangzhou) to Japan as trading ports. However, due to the diplomatic Triple Intervention of Russia, Germany, and France just one week after the treaty was signed, the Japanese withdrew their claim to the Liaodong Peninsula in return for an additional war indemnity of 30 million taels from China.

The Ryukyu Kingdom was a kingdom in the Ryukyu Islands from 1429 to 1872. It was ruled as a tributary state of the Ming dynasty by the Ryukyuan monarchy, who unified Okinawa Island to end the Sanzan period, and subsequently extended the kingdom to the Amami Islands and Sakishima Islands. The Ryukyu Kingdom played a central role in the maritime trade networks of medieval East Asia and Southeast Asia despite its small size. The Ryukyu Kingdom became a vassal state of the Satsuma Domain of Japan after the invasion of Ryukyu in 1609 but retained de jure independence until it was transformed into the Ryukyu Domain by the Empire of Japan in 1872. The Ryukyu Domain was formally annexed by Japan in 1879 and reorganized as Okinawa Prefecture, and the Ryukyuan monarchy was integrated into the new Japanese nobility.

Tianxia (Chinese: 天下; pinyin: Tiānxià; lit. '[everything] under Heaven') is a Chinese term for a historical Chinese cultural concept that denoted either the entire geographical world or the metaphysical realm of mortals, and later became associated with political sovereignty. In ancient China and imperial China, tianxia denoted the lands, space, and area divinely appointed to the Chinese sovereign by universal and well-defined principles of order. The center of this land was directly apportioned to the Chinese court, forming the center of a world view that centered on the Chinese court and went concentrically outward to major and minor officials and then the common subjects, tributary states, and finally ending with fringe barbarians.

The center of this world view was not exclusionary in nature, and outer groups, such as ethnic minorities and foreign people, who accepted the mandate of the Chinese Emperor were themselves received and included into the Chinese tianxia. In classical Chinese political thought, the "Son of Heaven", having received the Mandate of Heaven, would nominally be the ruler of the entire world. Although in practice there would be areas of the known world which were not under the control of the Chinese monarch, in Chinese political theory the rulers of those areas derived their power from the Chinese monarch.

From 1910 to 1945, Korea was ruled by the Empire of Japan as a colony under the name Chōsen (朝鮮), the Japanese reading of "Joseon".

Japan first took Korea into its sphere of influence during the late 1800s. Both Korea (Joseon) and Japan had been under policies of isolationism, with Joseon being a tributary state of Qing China. However, in 1854, Japan was forcibly opened by the United States. It then rapidly modernized under the Meiji Restoration, while Joseon continued to resist foreign attempts to open it up. Japan eventually succeeded in forcefully opening Joseon with the unequal Japan–Korea Treaty of 1876.

Hong Taiji (28 November 1592 – 21 September 1643), also rendered as Huang Taiji and sometimes referred to as Abahai in Western literature, also known by his temple name as the Emperor Taizong of Qing, was the second khan of the Later Jin dynasty and the founding emperor of the Qing dynasty. He was responsible for consolidating the empire that his father Nurhaci had founded and laid the groundwork for the conquest of the Ming dynasty, although he died before this was accomplished. He conquered Inner Mongolia and the remainder of Manchuria and invaded Korea, which became a Qing tributary state. He was also responsible for changing the name of the Jurchens to "Manchu" in 1635, and changing the name of his dynasty from "Great Jin" to "Great Qing" in 1636.