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.
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The Fourth Crusade was called by Pope Innocent III to retake Jerusalem from its current Muslim overlords.
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Jose de San Martin's most important achievement was leading the revolutions against Spanish Royalists in Argentina (1812), Chile (1818), and Peru...
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The government had to spend money for supplies for the military so economic changes for civilians were very real
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As famous as Marco Polo is, he didn't invent anything. However, other inventions such as the compass and the boat influenced Polo. Marco Polo used the compass on all of his travels but especially to reach Asia.
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