“The Napoleonic Wars and the New World Order that Followed (1803–1815) The Napoleonic Wars lasted from 1803 to 1815, when Great Britain and its allies defeated Napoleon and his allies. As is usual, the victors got together to create a new world order, which was hashed out at the Congress of Vienna. It drew new boundaries to ensure that no European power would become too dominant, based on balance of power concepts that would avoid war. The British emerged as the world’s leading empire, and as is typical after the war and the establishment of a new order, there was an extended period of peace and prosperity—the Pax Britannica. Western Powers Move into Asia (1800S) The British and other Western powers brought their gunboats to India, China, and Japan in the mid-1700s and into the 1800s, causing dramatic disruptions to the course of their histories. At the time, both China and Japan were isolationist.”