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Before the advent of airplanes and automobiles, the best way to move commercial goods between the U.S. East Coast and West Coast was...- by a network of railroads running through cities including Tacoma, Billings, St Paul, and Chicago.- by barge or other boats through the interconnected series of great rivers, for example Columbia, Missouri, Mississippi, and Ohio.- via freighter and cargo ship from Pacific port to Atlantic port through the newly constructed Panama Canal.- through the relay system of the Pony Express.

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