Here are a few materials for I.8.b – Distinguish between economic and geographic factors. Enjoy – and let me know if you recommend any changes to these!
The first 
activity is what I call a Wall Activity – and when you look at it, you’ll see why. This is a good introduction to geographic and economic factors and their role in the Western Movement.
Download the fifteen-page document that includes page-sized pictures to use in the activity.
The second activity is a t-chart in which students distinguish between geographic and economic factors that supported the Western Expansion.