Lewis and clark are a well-known pair that were responsible for the expansion. They held the expedition to explore the land and came back to explain everything they saw. Ambrose includes that, “James Ronda points out, “Generations of empire builders had used the fur trade to secure Indian Allies,’” Not only do Lewis, Clark, Ronda, Jefferson, they all have a part in this expansion, and so do the indians. They were not well known and heroic people; they were average people. They agreed to become allies with us to help us expand buy doing many things including trading goods. There are many of things that could not have been done during the expansion without the help of the