Answer: The Battle of Waterloo was fought on 18 June 1815 between Napoleon's French Army and a coalition led by the Duke of Wellington and Marshal Blücher. The decisive battle of its age, it concluded a war that had raged for 23 years, ended French attempts to dominate Europe, and destroyed Napoleon's imperial power forever.
Explanation: As an important neutral trading nation, the United States became ensnarled in the European conflict that pitted Napoleonic France against Great Britain and her continental allies.