| Y/M/D | Description | Place |
|---|---|---|
| 1843/03/00 | John Fremont's report on his expedition along the Oregon Trail to the Rocky Mountains in Wyoming, makes him a national celebrity and sets off a wave of emigrants | |
| 1849/00/00 | United States Army buys Fort John to uses as a base to protect travelers on the Oregon Trail. | Fort Laramie National Historic Site, Fort Laramie |
| 1850/00/00 | Between 1846 and 1850, as many as 4,000 emigrants cross the Oregon Trail and follow the Barlow Road into the Clackamas watershed. | Barlow Road, Oregon |
| 1850/09/27 | The US Congress passes the Oregon Donation Land Act, which provides up to 320 acres per person over age 18 who will settle in Oregon before the end of the year. | Oregon, United States of America |
| 1863/00/00 | Montpelier is settled in by Mormon pioneers on the route of the Oregon Trail. | Montpelier, ID, Idaho |
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