Hadrian was emperor of the Roman Empire from 117-138 years. He was a strong ruler committed to strengthening the Empire and Hadrian oversaw many important construction projects, including the Temple of Venus, Rome and hadrian's Wall.
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The main <span>connection between the Great Wall and the Mongols was that the Great Wall was erected by the Chinese in an attempt to keep the Mongols out of China (this largely failed). </span>
The Columbian Exchange lead to an increase in the demand for skilled labor in Europe, because D) an abundance of raw materials from the new world needed to be made into finished goods. Many raw materials and new products were brought over to Europe from the Americas which needed to be made into finished products.
