Westphalia to be Catholic. Osnabrück was divided almost equally between Catholicism and Protestantism. Parts of Westphalia came under Brandenburg-Prussian control during the 17th and 18th centuries, but most of it remained divided by duchies and other areas of feudal power. The Peace of Westphalia of 1648, signed in Münster and Osnabrück, ended the Thirty Years' War. The concept of nation-state sovereignty resulting from the treaty became known as "Westphalian sovereignty". After the defeat of the Prussian Army by the French at the Battle of Jena–Auerstedt, the Treaty of Tilsit in 1807 made the easternmost portion of today's Westphalia part of the
Treaty establishing the European Defence Community Treaty establishing the European Defence Community The Treaty establishing the European Defence Community, also known as the Treaty of Paris, is an unratified treaty signed on 27 May 1952 by the six 'inner' countries of European integration; West Germany, France, Italy, and the Benelux countries. The treaty would have created a European Defence Community (EDC) with a pan-European defence force. The treaty failed to obtain ratification in the French parliament, and consequently never entered into force. Instead, West Germany was admitted into the Western European Union (WEU), a dormant successor of the 1948 Western Union, as well as NATO. The