You can infer that they had a very strong economy because they did not need to expand their own economy. They stole from others.
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The Mongol invasions of Japan (元寇 Genkō), which took place in 1274 and 1281, were major military efforts undertaken by Kublai Khan to conquer the Japanese archipelago after the submission of Goryeo (Korea) to vassaldom. Ultimately a failure, the invasion attempts are of macro-historical importance because they set a limit on Mongol expansion and rank as nation-defining events in the history of Japan.
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The topography of Ancient Egypt was special and permitted Egypt to turn into an extremely effective human advancement. Egypt's topography contributed all parts of Ancient Egyptians lives, for example, the Nile River being their wellspring of food, water, and transportation and the desert offering normal assurance.
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