How was rockefeller able to become so successful in the oil business? he set about forcing competitors to sell out to him. he was the only one to use railroads for shipping his oil. he knew where all the best oil fields could be found. since he had so much money, he would underbid other companies.

zheng he was a chinese explorer who lead seven great voyages on behalf of the chinese emperor. his seven total voyages were diplomatic, military, and trading ventures, and lasted from 1405 – 1433. however, most historians agree their main purpose was to promote the glory of ming dynasty china.

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