Oregon Trail | Definition, History, Map, & Facts (2024)

Early trailblazers

Portions of what was to become the Oregon Trail were first used by trappers, fur traders, and missionaries (c. 1811–40) who traveled on foot and horseback. Until the trail’s development as a wagon route, however, people of European descent (whites) in eastern North America who wished to travel to California or Oregon generally went by ship around the southern tip of South America, an arduous and often harrowing sea journey that could take nearly a year to complete. Thus, before the turn of the 19th century few whites had ventured into the vast territory west of the Mississippi River that came to be included in the U.S. government’s 1802 Louisiana Purchase. One of those was the French Canadian trapper and explorer Toussaint Charbonneau. He and Shoshone wife Sacagawea were instrumental members of the Lewis and Clark Expedition (1804–06), the government’s first attempt to systematically explore, map, and report on its newly acquired lands and the Oregon country that lay beyond them.

In 1810 fur entrepreneur John Jacob Astor organized an expedition of frontiersmen to head westward and establish a trading post for his American Fur Company in Oregon. The men followed the Missouri River upstream from St. Louis to Arikara Indian villages in what is now South Dakota and then struck out on the difficult trek across the plains and mountains through Wyoming and Idaho to Oregon. There they, and another group that had sailed there by ship, established in 1812 Fort Astoria (now Astoria, Oregon) near the mouth of the Columbia River, the first American-owned settlement on the Pacific Ocean coast and what the company hoped would be the major post from which Astor would conduct trade with China.

Astor’s expedition, in dire need of supplies and help, sent members back east in 1812. During that journey Robert Stuart and his companions discovered the South Pass in southwestern Wyoming, a 20-mile (32-km) gap in the Rocky Mountains that offered the lowest (and easiest) crossing of the Continental Divide. (Lewis and Clark, unaware of the pass, had crossed the divide at a more treacherous spot farther to the north.) Astor’s venture foundered, however, when the British took over his post in 1813 during the War of 1812, and he sold his operation there to the North West Company (then a rival of the Hudson’s Bay Company, the dominant fur traders in the Northwest and Canada).

Despite Stuart’s detailed account of the Astor expedition, the South Pass remained largely ignored. In 1806 Zebulon Montgomery Pike, after exploring the Great Plains region, had famously called the West the Great American Desert, a judgment given even wider publicity by Stephen H. Long after he led an expedition to the southern Great Plains in 1819–20. For some years thereafter an American public that initially had been thrilled by the reports of Lewis and Clark became swayed against the West. Not until trappers Jedediah Smith and Thomas Fitzpatrick rediscovered the pass in 1824 did that critical route through the mountains became widely known.