Implies the future of the European Union
Throughout the conflict, Napoleon's goal was to rule all of Europe and create a single state that would be under his power. The conflict at Waterloo was not merely one of military might, but also one of ideas and precepts between the supranational state and the nation-state.
Napoleon Bonaparte's plans were being resisted by the Prussian and British armies. They opposed Napoleon's attempt to rule all of Europe. Napoleon's defeat signaled the end of the nation-state and the idea of imposing authority on Europe.
The idea of unification won the day after Napoleon Bonaparte was overthrown. So, it implies the future of the European Union, which is one of the best significance of the battle of French revolution.