Nation-state: A state in which the cultural borders of a nation correspond with the state borders of a country, where territory matches culture (Example: Japan, Denmark, Poland)
Multinational state: A state that contains more than one nation, and no single ethnic group dominates the population (Example: Former Yugoslavia, former USSR, Lebanon)
Multistate nation: Nation stretches across borders and across states, where people share a common characteristic and live in multiple states (Example: Kurds, Koreans)
Autonomous region: Sections of a nation that have a degree of independence in several issues, control over certain affairs, make own decisions (Example: Many regions in China, Aland islands)
Land and maritime boundaries, international agreements, and organizations like the United Nations Convention on the Law of the Sea influence national or regional identity
Factors that can lead to the devolution of states include physical geography, ethnic separatism, ethnic cleansing, terrorism, economic and social problems, and irredentism