To categorize the factors you've listed as internal or external, we can define internal factors as those that originate within a society or state, while external factors are influences that come from outside that society or state.
Internal Factors:
- Fighting between provinces and governors for power
- Land distribution issues
- Higher taxes on farmers
- Lack of food
- Growing gap between rich and poor
External Factors:
- Peasant revolts (while this may seem internal, it is often a response to external pressures or conditions)
- Raids from Mongols
- Raids from Xiongnu
Keep in mind that historical analysis may interpret some of these factors differently depending on context, but the categorization above generally holds.
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