The Soviet Union was the first large country to have a Communist government. Since the fall of the Berlin Wall, liberal democracy has become an even more prevalent form of government.In the nineteenth and twentieth century, there was a significant increase in the size and scale of government at the national level. This included the regulation of corporations and the development of the welfare state. In political science, it has long been a goal to create a typology or taxonomy of polities, as typologies of political systems are not obvious. It is especially important in the political science fields of comparative politics and international relations. Like all categories discerned within forms of government, the boundaries of government classifications are either fluid or ill-defined.