Question

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 1

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.