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At the end of the First Opium War in 1842, Britain and China signed the Treaty of Nanking, which effectively overthrew the original mercantilist system by means of forcing open the ports of Canton, Amoy, Foochow, Ningpo, and Shanghai to British trading. Seeing that Britain could easily eliminate foreign competition in China with its new privileges and considerable trading prowess, Americans found the need to reestablish their diplomatic relations and commercial equality in China; for the past fifty-nine years, Americans had been interacting with China merely through their business transactions, without government-to-government communication. As a result, the administration of President John Tyler sent the commissioner Caleb Cushing to negotiate a treaty in which America would receive the same privileges as Britain. Cushing, in the Treaty of Wanghsia in 1844, not only achieved this goal but also won the right of extraterritoriality, which meant that Americans accused of crimes in China were to be tried by American courts only. This treaty was monumental in that it laid the foundation for a more extensive and regulated American trade with China; American ships would no longer make the sporadic—and somewhat reckless—voyages to China so characteristic of the Old China trade.
Read more about this topic: Old China Trade