The 1850s saw the rapid growth of Western imperialism. Some of the shared goals of the western powers were the expansion of their overseas markets and the establishment of new ports of call. The French Treaty of Huangpu and the American Wangxia Treaty both contained clauses allowing renegotiation of the treaties after 12 years of being in effect. In an effort to expand their privileges in China, Britain demanded the Qing authorities renegotiate the Treaty of Nanjing (signed in 1842), citing their most favoured nation status. The British demands included opening all of China to British merchant companies, legalising the opium trade, exempting foreign imports from internal transit duties, suppression of piracy, regulation of the coolie trade, permission for a British ambassador to reside in Beijing and for the English-language version of all treaties to take precedence over the Chinese language.