Answer: The Black Death was an epidemic of bubonic plague, a disease caused by the bacterium Yersinia pestis that circulates among wild rodents where they live in great numbers and density. ... Plague among humans arises when rodents in human habitation, normally black rats, become infected.
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Answer is A. China opened up trade with the U.S.
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C) Álvar Núñez Cabeza de Vaca
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A. Federalism
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Federal power is that of a state/ province/ prefecture's governance among their population in that specific area and is overviewed by the national government.