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  • During its history, the United States has developed various vehicles and modes of transportation: wagons, stagecoaches, automobiles, railroads, aircraft, and watercraft. Some modes were used for communication, as were the Pony Express and later the railroads. These particularly aided in development of the western states. Many of today's major highways are on the routes once used by pioneers, including the Oregon Trail, Santa Fe Trail, and the Mormon Trail. Influential in the development of transportation in the West was the doctrine of Manifest Destiny, as used by President James K. Polk. Accidents and resultant safety measures have also played a role in the development of all motorized forms of transportation.

    Population density, historically low in the West, has influenced the types of transportation that became dominant ...

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