Answer: yes, there is that type of theory.
Explanation: it was the first theory that explained about a ramp that was built on one side of the pyramid and as the pyramid grew, the ramp used to move the blocks up to the top.
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Answer: Mongol leader Genghis Khan (1162-1227) rose from humble beginnings to establish the largest land empire in history. After uniting the nomadic tribes of the Mongolian plateau, he conquered huge chunks of central Asia and China.
Explanation:
They're not coming to take over our home land they're just looking for new opportunities that their homeland did not provide