I think it was a egyptain prime
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Answer: Christopher Columbus was determined to find a direct water route west from Europe to Asia, but he never did. Instead, he stumbled upon the Americas.
Explanation: Hope this helped! :)
The best answer is B) Difficulties in royal succession.
One issue that the Mongol Empire had was a lack of a system of orderly succession when a ruler's end came. Future Islamic Empires, influenced by the Mongol ruling traditions, often experienced similar problems.