05/22/2026
On this day in U.S. History: One-thousand pioneers departed Elm Grove, Missouri on May 22, 1843 in the first major wagon train to western Oregon on the Oregon Trail, which became known as the Great Migration of 1843 or, sometimes, the Great Emigration. The 1843 wagon train began America’s large-scale westward expansion and the settlement of the Oregon Territory.
Explorers and traders began entering the Pacific Northwest in the late 1700s, with American explorer Captain Robert Gray entering present-day Oregon in 1792 and naming the Columbia River. In 1805, Meriwether Lewis and William Clark identified navigable routes from St. Louis to the Pacific Coast during their Corps of Discovery expedition, opening the way for future American migration into the Oregon Territory.
Throughout the following decades, fur traders, missionaries, and farmers traveled from the eastern United States to the Oregon Territory and established small settlements throughout the region, particularly in the fertile Willamette Valley. Their reports describing Oregon’s rich farmland, timber, and natural resources spread eastward through lectures, newspapers, and books, increasing interest in western migration among pioneers.
Small groups of pioneers began making the difficult journey west in the early 1840s, with approximately 70 settlers arriving in Oregon in 1841 and roughly 100 more following in 1842. The success of these two groups proved that families could survive the overland wagon journey in meaningful numbers, increasing confidence and interest among more pioneers wanting to make the journey.
On May 22, 1843, a wagon train of 1,000 men, women, and children, which included 100 wagons and 5,000 oxen, departed Elm Grove, Missouri, located near St. Joseph, and began the long and difficult journey to western Oregon. Because the group was so large, and the largest to ever migrate west, it became known as the Great Migration of 1843.
The wagon train was led by Dr. Elijah White, a Presbyterian missionary. He guided the wagon train along the 2,000-mile trail which became known as the Oregon Trail. The trail traversed through present-day Missouri, Kansas, Nebraska, Wyoming, Idaho, and into Oregon. The first arrivals from the wagon train entered the Willamette Valley around October, with the remainder reaching the valley in November.
In 1845, the wagon train to Oregon jumped to 3,000 pioneers. In the years to come, it would become an annual event as more Americans moved west to settle open land until 1884, when the Union Pacific Railroad built a line along the trail route.
Painting is by William Henry Jackson depicting pioneers traveling on the Oregon Trail along the North Platte River near present-day Scotts Bluff, Nebraska.