On January 18, 1803, Thomas Jefferson requests funding from Congress to finance the Lewis and Clark expedition. Jefferson officially asked for $2,500 in funding from Congress, though some sources indicate the expedition ultimately cost closer to $50,000. Meriwether Lewis was joined by his friend William Clark and 50 others on the journey. The team, which Jefferson called the Corps of Discovery, first surveyed the territory that comprised the Louisiana Purchase, a vast expanse that reached as far north as present-day North Dakota, south to the Gulf of Mexico and stopped at the eastern border of Spanish territory in present-day Texas. The team then crossed the Rockies and navigated river routes to the Pacific coast of present-day Oregon. Upon their return, the duo’s reports of the exotic and awe-inspiring new lands they had encountered sparked a new wave of westward expansion.