A. It helped determine the outcome of the Civil War
B. It allowed the East coast to trade with the Great Lake Sea.
C. It established Boston and Philadelphia as the most important centers of trade.
D. It took water traffic away from the Mississippi River
Đáp án là C
Câu A: “It also contributed in a number of ways to the North's victory over the South in the Civil War.” Câu B & D: “It permitted trade between the Great Lake region and the East coast, robbing the Mississippi River of much of its traffic.”
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