Treaty ports (Chinese: 商埠; Japanese: 条約港) were the port cities in China and Japan that were opened to foreign trade mainly by the unequal treaties forced upon them by Western powers, as well as cities in Korea opened up similarly by the Qing dynasty of China (before the First Sino-Japanese War) and the Empire of Japan.
The following year the Chinese and British signed the Treaty of the Bogue, which added provisions for extraterritoriality and the most favored nation status for the latter country.
The bund was a self-governing operation with its own shops, restaurants, recreational facilities, parks, churches, courts, police, and local government.
The three main treaty powers, the British, the Americans, and the French, continued to hold their concessions and extraterritorial jurisdictions until the Second World War.
The foreigners took out long-term leases on the land and set up factories, offices, warehouses, sanitation, police, gardens, restaurants, hotels, banks, and private clubs.
[8] The European community promoted technological and economic innovation, as well as knowledge industries, that proved especially attractive to Chinese entrepreneurs as models for their cities across the growing nation.
Investments now poured into building a railway-plus-telegraph system knitting China together, connecting the treaty ports, and other major cities, as well as mining districts and agricultural centers.
Chinese merchants headquartered there set up branches across Southeast Asia, including British Singapore and Malaya, the Dutch East Indies, French Indochina, and the American Philippines.
[13] The information industry flourished in the port cities, with printing shops, newspapers, magazines, and pamphlets in Chinese and European languages.
The missionaries had very modest success in the conversion of the Chinese population but discovered they became widely popular for setting up medical and educational facilities.
Many adopted ideas and used the facilities newly opened to them to network with each other, set up organizations and publications, and plot a revolution against the Qing government.
Aggressive Japanese moves to dominate China in World War I caused a strong backlash of nationalism in the May Fourth Movement, which focused its ire not just on Japan, but also on the entire port city system as emblematic of imperialism that should no longer be tolerated.
[17] The national government had almost no police power in the port cities, allowing secret societies to flourish in the Chinese community, some of which turned into criminal gangs.
[19]: 51 Researcher Zongyuan Zoe Liu writes that "[t]he success of these cities as 'red' treaty ports represented another step in China's overall reform and opening-up plan while legitimizing the leadership of the CPC over the Chinese state and people.
[21] Following the Ganghwa Treaty of 1876, the Korean kingdom of Joseon agreed to the opening of three strategic ports and the extension of legal extraterritoriality to merchants from Meiji Japan.