W crop civilization in the America’s believed to have originated in the area of South America and Mexico
Answer:
Right answers:
- Warlords split China into warring kingdoms.
- Nomadic peoples invaded northern China.
Explanation:
Periods of division, chaos and anarchy have alternated with periods of unity and strong imperial , centralized rule in China´s history. The Period of Disunion came after the fall of the Han Dynasty in 220 AD. Is lasted over 350 years until China was reunited again. The old Han empire broke into separate, smaller kingdoms that waged war with each other. On the other hand, Nomadic people - "barbarians" for the Chinese - were always a security threat for the empire, there was a permanent threat of invasion by the northern "barbarians."
