Answer:
The spread of the bubonic plague from Central Asia into Europe decimated the populations but increased opportunities for the survivors. An enormous variety of new consumer goods, agriculture, weaponry, religion, and medical science became available in Europe.
The reason for why is very simple: they believed it would increase their chance of wining. This is a common practice in the US politics and why the two main parties are well the only important parties in the US today. It is because they adapt and incorporate the beliefs of minor parties that appear and they address the issues raised by the new parties.
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A text that fits this criteria would be a "secondary source" since it is compiled by primary sources (which are used as direct evidence). Although certain secondary sources are reliable in other ways.
Historians know that the philosophy and methodology of history have changed over time and will keep changing. Many different interpretations of all historical topics exist. Historians must work to recognize the difference between facts and interpretations in their field
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