Political science is the study of the state, government, and politics. It examines how individuals associate into political communities and how those communities are governed. The scope of political science includes political theory, public law, and public administration. It is interrelated with other social sciences like history, economics, geography, sociology, anthropology, and psychology. The goals of studying political science include gaining knowledge and understanding of citizenship, government, and liberal education. A state is defined as a political community occupying a territory with its own government and sovereignty. States are distinguished from nations and governments. Governments are necessary to advance public welfare and consequences arise in their absence. Forms of government vary based on who exercises sovereign power and the relationship between branches