Answer:
Their expedition promoted Manifest Destiny and the Americans believed that all the land in the Americas rightfully belonged to them.
Explanation:
Lewis and Clark's experience impacted America greatly, by opening up new territory for fur and lumber trade, and highlighted the best land for agriculture and future settlement. More land and resources were discorvered and acquired thanks to the Lewis and Clark expedition. However, their experience changed our understanding of the Americas as they symbolized America as a rising nation, and manifest desitny was given a new meaning. Americans believed that they were the rightful owners and conquerers of the land of the Americas. It propelled more people to go out and discover more about the land, and they believed that it belonged to them. This caused future conflicts between the indigineous people (Native Americans) and the Americans as their land was being taken from them.
