Population growth in the West in the late 1850s made a new trail necessary. Which trail was a consequence of that growth?

The Butterfield-Overland Trail was established in 1858 to carry mail and passengers between the East and the growing communities of the West. The Santa Fe, Mormon, and California Trails had been established earlier, so the new route connected with growth in the late 1850s refers to the Butterfield-Overland Trail.

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