Which expedition provided crucial knowledge about the Louisiana Territory?

The correct answer is the Corps of Discovery. This expedition, commissioned by President Thomas Jefferson in 1804, was led by Meriwether Lewis and William Clark. Its primary aim was to explore the newly acquired Louisiana Territory following the Louisiana Purchase in 1803 and to find a route to the Pacific Ocean.

Throughout the journey, the Corps of Discovery mapped vast stretches of land, gathered essential information about the geography, flora, fauna, and native inhabitants of the region. Their work provided the United States with invaluable data that facilitated future expansion and settlement. The expedition also significantly impacted American knowledge of the western frontier and laid the groundwork for future exploration and development.

The other options do not directly correlate to this significant expedition. While "Corps of Exploration" and the other names might suggest exploratory activities, they are not the officially recognized title of Lewis and Clark's mission, which is specifically known as the Corps of Discovery. This distinction is crucial in understanding the specific historical context and contributions of the expedition regarding knowledge about the Louisiana Territory.