Final answer:
The Middle States region had the most canal building projects, especially with the completion of the Illinois & Michigan Canal in 1848, which linked the Great Lakes and Mississippi Valley.
Explanation:
The Middle States region of the United States had the most canal building projects. The completion of the Illinois & Michigan Canal in 1848 created a direct link between the Great Lakes and the Mississippi Valley, solidifying Chicago's importance. This contrasts with the Southern states, which had fewer canal and railroad projects due to a focus on agriculture.
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