N What was one way the Chinese tried to protect themselves during the Warring States period?
They created alliances with other nations.
They built barriers like the Great Wall of Qi.
They pitted feudal leaders against one another.
They fled the capital of Luoyang to avoid invaders.

Match your vocabulary word to its definition. 1. emigration 2. immigration 3. migration 4. overpopulation 5. sustainable development 6. under population 7. unsustainable development 8. urbanization the movement from one place to another the number of people exceeds the available natural resources in an area leaving one's homeland to settle in a new place the increase in the population of a city the movement of people to a new country the ability to meet current needs without reducing the ability to meet future needs resources being used up at a faster rate than they can be replenished birth rate insufficient to replace the existing population