Louis and Clark was sent by Thomas Jefferson to find out what was in the south. They found many Indian tribes, and plants and animals. Sacagawea helprd them on their journey leading the way. They found the Pacific Ocean on 1806, then they created a fort named Fort Clatsop.
The Lousiana Purchase was in 1803, it was sold for $15,000,000 million dollars. It started the Westward Expansion, and started the Louis and Clark expidition to the south