to 1850, Britain was involved in 137 wars or rebellions. It maintained a relatively large and expensive Royal Navy, along with a small standing army. When the need arose for soldiers it hired mercenaries or financed allies who fielded armies. The rising costs of warfare forced a shift in the sources of government financing, from the income from royal agricultural estates and special imposts and taxes to reliance on customs and excise taxes; and, after 1790, an income tax. Working with bankers in the city, the government raised large loans during wartime and paid them off in peacetime. The rise in taxes amounted to 20% of national income, but the private sector benefited from the increase in economic growth. The demand for war supplies stimulated the industrial sector, particularly naval supplies, munitions and textiles, which gave Britain an advantage in international trade during the postwar years. The French Revolution polarised British political opinion in the 1790s, with conservatives outraged at the killing of the king, the expulsion of the nobles, and the Reign of Terror. Britain was at war against France almost continuously from 1793 until the final defeat of Napoleon in 1815. Conservatives castigated every radical opinion in Britain as "Jacobin" (in reference to the leaders of the Terror), warning that radicalism threatened an upheaval of British society. The Anti-Jacobin sentiment, well expressed by Edmund Burke and many popular writers was strongest among the landed gentry and the upper classes. British Empire The Seven Years' War, which began in 1756, was the first war waged on a global scale, fought in Europe, India, North America, the Caribbean, the Philippines and coastal Africa. Britain was the big winner as it enlarged its empire at the expense of France and others. France lost its role as a colonial power in North America. It ceded New France to Britain, putting a large, traditionalistic French-speaking Catholic element under British control. Spain ceded Florida to Britain, but it only had a few small outposts there. In India, the Carnatic War had left France still in control of its small enclaves but with military restrictions and an obligation to support British client states, effectively leaving the future of India to Britain. The British victory over France in the Seven Years' War therefore left Britain as the world's dominant colonial power. During the 1760s and 1770s, relations between the Thirteen Colonies and Britain became increasingly strained,