What’s the definition of oregan trail

The Oregon Trail was a roughly 2,000-mile route from Independence, Missouri, to Oregon City, Oregon, which was used by hundreds of thousands of American pioneers in the mid-1800s to emigrate west. The trail was arduous and snaked through Missouri and present-day Kansas, Nebraska, Wyoming, Idaho and finally into Oregon.

Explanation:

It is a route used during the U.S. westward migrations, especially in the period from 1840 to 1860, starting in Missouri and ending in Oregon.