CHAPTER 10: EXTERNAL THREATS
Page 174- Recap questions

Q: What were the measures taken by the ancient Chinese against foreign invasions?
Having a tribute system:
Han Wudi, emperor of the Han dynasty wanted to expand his empire into northern vietnam, inner mongolia etc. To mantain the conquered land, they will constantly give tributes to him as he promised to help them when they were under attack from their rival tribes and kingdoms.

Physical barriers:
The great wall of china was a good example of a physical barrier that was bulit. Construction first began during the Period of warring states. It protected from foreign invasions (ex: mongolia)