From End of the Oregon Trail, America’s Library:
The Oregon Trail was a route used by people who traveled to Oregon Country, which is what Oregon was called before it became a state in 1859. The Oregon Trail was the most popular way to get to Oregon Country from about 1843 through the 1870s. The trail started in Missouri and covered 2,000 miles before ending in Oregon City.
Oregon National Historic Trail History & Culture National Park Service
Oregon Trail historical newspaper coverage 1880 and beyond