 After the Napoleonic Wars, Europe was confronted with the new "nationalities question", leading to reconfigurations of the European map, on which the frontiers between the states had been delineated during the 1648 Peace of Westphalia.Nationalism had made its first appearance with the invention of the "levée en masse" by the French Revolutionaries, thus inventing mass conscription in order to be able to defend the newly founded Republic against the "Ancien Régime" order represented by the European monarchies.This led to the French Revolutionary Wars (1792–1802) and then to the conquests of Napoleon, and to the subsequent European-wide debates on the concepts and realities of nations, and in particular of nation-states.