Alexia is writing an essay on how the transcontinental railroad impacted the US in the 1800s. Which source would be most relevant for Alexia?
A
a text analyzing how US railroads influenced population changes over the yearsB
a text covering the history of trains in the US from its beginnings to modern dayC
a text describing available forms of transportation in the US during the 1800sD
a text discussing John Stevens' invention of the American steam locomotive in 1825