Franco-German Frontiers
THE frontier between France and Germany is one of the oldest, as well as one of the newest, problems of European politics. It is, from one point of view, as old as Caesar's Gallic wars and the Germanic invasions of the Roman Empire, as new as the treaty of Versailles, and even newer. Some elements in it are almost secular in their persistence, some are only of recent origin.
Source: foreignaffairs.com