The foundation of the empire in 1871 begins a new era in the history of Germany. The rivalry of the dynasties to which for so long the interests of the nation had been sacrificed now ceased. By the treaties of Versailles the kingdoms of Bavaria and Württemberg, and the grand-duchy of Baden, as well as the southern provinces of the grand-duchy of Hesse, were added to the North German Confederation. Henceforward all the German states that had survived the struggle of 1866, with the exception of the empire of Austria, the grand-duchy of Luxemburg, and the principality of Liechtenstein, were incorporated in a permanent federal state under the leadership of Prussia. The revision in 1871 made no important alterations in the constitution of 1867. The states retained their autonomy except in those matters which were expressly transferred to the imperial authorities; the princes retained their sovereignty; the king of Prussia, though he now took the title of German emperor, was only _primus inter pares_; he was president of the confederation, but had no suzerainty over the other princes. None the less, from this time the acts of the state governments and parliaments have ceased to have more than a local importance; the history of the nation is centred in Berlin, in the Bundesrat or federal council, in which the interests of the individual states are represented; in the Reichstag, in which the feelings and wishes of the nation are expressed; and above all, in the Prussian government and imperial executive. The empire and the states.