1. Cause:
Increased demand for land west of the Appalachian. Increased number of "pilgrims" to the west. Annexation of Texas by the Federal Government.
2. Cause:
Need for more land for western settlers. National "Manifest Destiny" dream. US and Britain settlement.
3. Cause:
Cessation of south-western territories to the US. Increased land mass and space for settlers.