In this era, the Royal Navy provided services around the world that benefited other nations, such as the suppression of piracy and blocking the slave trade. The Slave Trade Act 1807 had banned the trade across the British Empire, after which the Royal Navy established the West Africa Squadron and the government negotiated international treaties under which they could enforce the ban. Sea power, however, did not project on land. Land wars fought between the major powers include the Crimean War, the Franco-Austrian War, the Austro-Prussian War and the Franco-Prussian War, as well as numerous conflicts between lesser powers. The Royal Navy prosecuted the First Opium War (18391842) and Second Opium War (18561860) against Imperial China. The Royal Navy was superior to any other two navies in the world, combined. Between 1815 and the passage of the German naval laws of 1890 and 1898, only France was a potential naval threat.