The panama canal was built to shorten the trade route for ships between the east and west coast and ensure faster movement, more importantly, of what else?

Panama canal has military importance , since is a shorter route for naval ships to pass between Atlantic and Pacific oceans. It was built to shorten the trade route between the east and west coast, and also helped United States to  achieve its strategic plans.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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