1. Hunter Gatherer Civilizations
   1. Human Migration
2. Agriculture
   1. Stationarity
      1. Private Property
         1. Landlords
         2. Feudal Relationships
            1. Class Systems
   2. Surplus Food
      1. Specialization
         1. The City
            1. Government
            2. Subtopic 1
            3. Borders
            4. Military
            5. Empires
            6. Nation States
            7. Continental Systems
            8. City States
            9. Concentration of Population
            10. Water Supply
            11. Food Supply
            12. Waste Management
            13. Culture
         2. Diversified Economies
         3. Capital
            1. Financial Systems
            2. Money
            3. Credit and Banking
            4. Personal Wealth
         4. Labor
3. Main Topic 3