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
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