This graphic organizer, is a handout from Morra's History Shop that could be utilized as a homework assignment, or during a lesson to either introduce or reinforce the subject matter. The information on this handout is primarily geared for an 8th grade class. However, elements from the 7th grade U.S. curriculum are referenced throughout the handout. This handout is a great companion piece to a unit on U.S. Expansion, because the factors that helped accelerate this practice are outlined clearly.