Question

what led to the decline of the 3 new dynasties?
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Answer 1

Answer:

These dynasties were constantly in conflict with each other. This meant that they would have to maintain a strong army to be able to fight battles. This added pressure on their resources and eventually led to their decline.

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Answer 2

Answer:

Generally, there were two major factors that led to the decline of the Yuan Dynasty: one was the class conflict caused by the heavy taxation, the other one was the ethnic contradiction resulting from the 'Four Class System'. ... Also, power struggles within the ruling class became more and more serious.