By Matt Joyce
Fort Laramie, Wyoming (AP)

This image provided by the United States Geologic Survey shows Fort Laramie , Wyoming about 1870.
The frontiersmen who built this outpost in 1834 picked a spot they hoped would enable them to dominate the regional buffalo-hide trade: a valley where two rivers run together and the Great Plains meet the Rocky Mountains.

It was a remote place – the first permanent settlement in what would become the state of Wyoming, in fact.