In the eighteenth century Germany as a unified, sovereign state was only a vague idea. The Holy Roman Empire provided only a loose framework for more or less independent small states. In an area of 660,000 square kilometers there lived twenty-seven million inhabitants, divided among 310 territories, 50 imperial free cities, and 1,500 imperial knighthoods. Large German provinces such as East Prussia, West Prussia, and Schleswig were situated outside the imperial boundaries. The emperor had no real power. Since 1648 the territories had possessed sovereignty, and looked upon each other as foreign countries. Even a move to a neighboring village lying on the other side of the frontier was considered as emigration.