In 1832, the East India Company explored Shanghai and the Yangzi River as a potential trading center for tea, silk, and opium, but were rebuffed by local officials. Chinese attempts to prohibit the opium trade into China led to the First Opium War (1839-1842) with the United Kingdom; the Treaty of Nanjing, which concluded the war with a British victory, opened up five treaty ports in China to British merchants, including Shanghai. Similar treaties were quickly signed with other Western nations, and French, American and German merchants joined their British counterparts in establishing a presence in Shanghai, residing in sovereign concessions where they were not subject to Chinese laws. The British established their concession in 1845, the Americans in 1848 in Hongkou, north of Suzhou Creek, and the French set up their concession in 1849 west of the old Chinese city and south of the British Concession. In 1846, Peter Richards founded Richards' Hotel, the first western hotel in China. It would later become the Astor House. In 1850, the first English-language newspaper in Shanghai, the "North China Herald", was launched.