Christopher Columbus is the explorer who is credited for discovering America. Of course, there were already people living in America at the time who we call Native Americans. There even was a European, Leif Ericsson, who had been to the Americas before. However, it was Columbus' voyage that started the exploration and colonization of the Americas.
The reason why historians use the term “Middle Ages" is because this timer period took place between the fall of the western Roman Empire and the Renaissance--which were two major, innovative periods of history, whereas not much happened in the Middle Ages relative to them. <span><span>
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Answer:
James Watt- steam engine with condenser- used much less coal than earlier engines.
Henry Bessemer- Industrial process for steel production- made it cost efficient to produce steel from molten iron on a large scale.
Eli Whitney- Cotton gin- Allowed fibre to be extracted from seed more efficiently.
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Answer:
High temperatures, poor agricultural practices and resulting wind erosion.
