Final answer:
The Corps of Discovery, led by Meriwether Lewis and William Clark, spent the winter of 1805-1806 in present-day Oregon after reaching the Pacific Ocean.
Step-by-step explanation:
The expedition you're referring to is the Corps of Discovery, led by Meriwether Lewis and William Clark from 1804 to 1806. In the winter of 1805-1806, this team established their camp in present-day Oregon. This is after they had navigated through various terrains and hardships, including the Bitterroot Mountains of Montana, and they finally reached the Pacific Ocean in 1805.
They had embarked on this journey with the objective of exploring and mapping the newly acquired Louisiana Territory and also to find a possible all-water route to the Pacific Ocean. The presence of the Corps of Discovery team in Oregon during that winter showcased their tenacity and resilience in fulfilling their mission under extreme conditions.
Learn more about Corps of Discovery