Establishment
In 1863 John Bozeman and John Jacobs scouted for a direct route from Virginia City, Montana to central Wyoming to connect with the Oregon Trail, then the major passage to the West Coast. Before this, most access to the southwestern Montana Territory was from St. Louis via the Missouri River to Fort Benton. Thence travelers went by the 'Benton Road,' around the Great Falls and through the Chestnut, Hilger and Prickly Pear valleys (current site of Helena and Broadwater County, Montana).
The overland Bozeman Trail followed many north-south trails the American Indians had used since prehistoric times to travel through Powder River Country. This route was more direct and better watered than any previous trail into Montana. Bozeman's and Jacobs's most important contribution was to improve the trail so that it was wide enough for wagons. But there was a major drawback — the trail passed directly through territory occupied by the Shoshone, Arapaho, and Lakota nations.
Read more about this topic: Bozeman Trail