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The purpose for which the United States wanted to build the Panama Canal was:
C. It would allow US ships to travel back and forth between the Atlantic and Pacific more easily.
Building the Panama Canal would create a shorter route for ships traveling between the Atlantic and Pacific Oceans, saving time and money. This strategic waterway would greatly benefit trade, commerce, and military operations by providing a quicker and more efficient way for ships to pass between the two oceans without having to navigate around the southern tip of South America.