<span>The answer is A. Samuel Gompers. Samuel Gompers helped found the Federation of Organized Trades and Labor Unions in 1881, which was later reorganized into the American Federation of Labor in 1886, with Gompers as its president. He would remain president of the organization until his death.</span>
To combat the threat of tropical diseases such as malaria and yellow fever, the United States decided to use new measures to eradicate the disease before the construction of the Panama Canal. Under the leadership of Colonel William Crawford Gorgas, many changes were made. When it was discovered that mosquitoes were the source of the disease, Gorgas who was appointed as the head of hospital and sanitation, he made sure that containers with stagnant water were removed because mosquitoes lay their eggs there. He also built domestic water systems to eliminate the need to collect rain water. Prophylactic Quinine was supplied to the people in the area and fumigation and oiling of streams were launched. Those who were sick were quarantined and workers would sleep in screened structures so that mosquitoes would not be able to bite them. These programs resulted in the successful elimination of tropical diseases in the area and the health of workers improved.
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The underlying cause of the war was the colonists unrelenting desire for more and more land, but the immediate cause for its outbreak was the trial and execution of three of Metacom's men by the colonists. ... According to legend, Metacom sat in a cave on Avon Mountain and watched the burning of the town.
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Those who escaped envelopment and capture were forced back north. UN forces invaded North Korea in October 1950 and moved rapidly towards the Yalu River—the border with China—but on 19 October 1950, Chinese forces of the People's Volunteer Army (PVA) crossed the Yalu and entered the war.
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B: Mercantilism, Enlightenment, and the Great Awakening
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