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Which project led to the creation of a system of time zones across America?
a. digging the Panama Canal
b. establishing a national park system
c. building the transcontinental railroad
d. acquiring the territory of Alaska

Answer :

It was the "building of the transcontinental railroad" that led to the creation of a system of time zones across America, since allowed for the relatively rapid transport of both people and goods across the US, which required strict coordination. 

Answer:

c

Explanation:

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