- They were able to successfully complete their expedition, which was a very difficult and dangerous undertaking.
- They made important scientific discoveries, such as the Lewis's woodpecker and the grizzly bear.
- They helped to open up the American West to settlement and trade.
- They were able to establish good relations with many Native American tribes.
- They were both very intelligent and capable leaders.
Some bad things about Lewis and Clark include:
- They sometimes treated the Native Americans they encountered in a harsh and disrespectful manner.
- They were not always able to accurately document the plants and animals they encountered.
- They sometimes made poor decisions, such as attacking the Blackfoot Indians.
- Lewis was an alcoholic and died under suspicious circumstances.