how to keep America moving

Successful societies and growing economies have always depended on efficient transportation. Witness the roads of the Roman Empire, the canals of the Ming Dynasty, the ships of the British Empire, and the railroads that connected the American frontier. The Interstate Highway System, which began to be developed in the United States more than 50 years ago, parallels those earlier achievements. It helped facilitate the tremendous economic growth of the post–World War II era.

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