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firstly a is trade routes caused the spread to happen more widespread. second, The Black Death caused most government officials and political figures to become infected, and they locked themselves away in their homes until they died. and third, Improved commercial practices led to an increased volume of trade and expanded the geographical range of existing trade routes—including the Silk Roads, trans-Saharan trade network, and Indian Ocean—promoting the growth of powerful new trading cities.

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a system in which products were made rapidly by machines

c

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