Alexia is writing an essay on how the transcontinental railroad impacted the US in the 1800s. Which source would be most relevant for Alexia?

Alexia’s essay is about the railroad’s impact on the United States, so a source that analyzes changes the railroads caused is most relevant. The text about how US railroads influenced population changes directly examines one impact. The other choices discuss transportation generally, train history broadly, or one earlier invention rather than the transcontinental railroad’s effects.

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