Which of the following best summarizes the Lewis and Clark Expedition? 1. It explored the Louisiana Territory for a year before harsh weather forced it to return to the East.
2. It lasted six months and laid the groundwork for settlement along the Mississippi River.
3. It covered about eight thousand miles, mapping the Louisiana Territory and strengthening US claims to Oregon.
4. It covered about eight thousand miles in its search for a Northwest Passage, which it eventually discovered.