With the conclusion of the First World War the ages of global empires comes to an end and hitherto familiar and trusted ways of governing come to an end. Empires shatter, Kingdoms tumble. The interbellum is the age of mass mobilization of peoples in a host of new states. New political systems come to the fore (socialist, communist and fascist regimes), new concepts (universal suffrage, equal representation, corporatism, etcetera) claim their place in new liberal democracies that pop up throughout the world. New constitutions of a sixth generation - the Leviathan constitutions - enshrine the arrangements needed for these forms of mass mobilization.