Lewis and Clark begin their expedition with 31 men and 1 dog.
Sergeant Floyd was the only one who died the entire trip.
Lewis and Clark meet her husband, Toussaint Charbonneau, and his other wife, Little Otter.
Sacagawea, who was pregnant the entire trip, gives birth to her son, Jean Baptiste Charbonneau.
Sacagawea is reunited with her brother for the first time since she was kidnapped. She makes the heart-wrenching decision to leave him behind though.
The group first sighted the Pacific Ocean on November 7, only arriving two weeks later.
Robert Stuart is the first person to use the Oregon Trail.
Marcus and Narcissa Whitman were the first people to bring a wagon along on the Oregon Trail.
In the spring of 1843, about 1,000 people gathered together at Independence, Missouri.
By the late 1840s, more than 50,000 people were using the trail every year!