One major effect of Lewis and Clark's expedition was the significant expansion of knowledge about the geography, natural resources, and indigenous peoples of the western region of the United States. The expedition produced detailed maps and scientific descriptions of the flora, fauna, and landscapes of the newly acquired Louisiana Purchase territory, paving the way for future exploration, settlement, and development in the West. Their expedition provided valuable information that facilitated the subsequent expansion of the country and the establishment of trade routes in the region.
