The correct answer for the question that is being presented above is this one: "Thomas Edison." Thomas Edison improved the incandescent light bulb and he made it possible to quit using oil lamps as a source of light, which sometimes unsafe.
Although it was unsuccessful, the Crusades introduced Europeans to the luxury of the Muslim civilization. When the Crusaders brought home silks, porcelain, spices and other goods, demand for these things in Europe began to grow, especially as the emerging bourgeois class of Europeans became a market for these luxury goods.
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Increased trade and use of money, which undermined serfdom and led to prosperity of northern Italian cities.
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D. 1800s because that's when Cuba, Puerto Rico and Mexico gained independence
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Eastern edge of Great wall was Pyongyang in North Korea in ancient, but Dandong is edge now
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