What was the impact for the Lewis and Clark expedition?

Today, we see Lewis and Clark's impact. It is everywhere, from the farming in Nebraska to the roads in Colorado! Lewis and Clark kept journals, so we have those to tell us what it was like in the days of Lewis and Clark. Lewis and Clark told what it was really like here, [in the Midwest] so then the east knew what here [the Midwest] was like. That made it possible that people settle here! :)