1. The development of a national market for goods and services within the United States was largely a result of — A. government safety regulations
B. tariffs on manufactured goods
C. increased demand for cheap labor
D. improvements in transportation

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explanation: i just want to

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  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

answer is d