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A team of engineers including Henry Martyn Robert (Robert's Rules of Order) designed a plan to raise much of the existing city to a sufficient elevation behind a seawall so that confidence in the city could be maintained
The empire was founded by Sundiata Keita and became renowned for the wealth of its rulers, especially Mansa Musa I hope this is helps
After nearly four centuries of internal divisions and strife, China was reunited under the leadership of Yang Jian. A member of a respected aristocratic family, Yang Jian founded the Sui Dynasty. Yang Jian used Buddhism to help unite the kingdom.