Which transportation breakthrough had the GREATEST impact on the economic development of the American frontier in the late- 1860s? A) the Erie Canal B) the automobile C) the interstate highway system D) - QAmmunity.org

Which transportation breakthrough had the GREATEST impact on the economic development of the American frontier in the late- 1860s? A) the Erie Canal B) the automobile C) the interstate highway system D)

asked Sep 23, 2021 78.4k views

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