Why does the corps of discovery matter in the pages of history?

It doesn't matter. The Spanish pursued them 4 times because the Spanish had claim on the land. They eventually left their claim when the US signed the Treaty of Guadalupe Hidalgo, if it really was signed with full effect.

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)

answer; i believe that the correct answer is (tobacco);