What Feature Formed The Western Border Of The United States - Web in 1789, the western border of the united states was the mississippi river. 1) the basin and range, 2) the columbia. Beyond the river lay the large spanish. Web the western states are divided up into six different geologic provinces:
Beyond the river lay the large spanish. 1) the basin and range, 2) the columbia. Web in 1789, the western border of the united states was the mississippi river. Web the western states are divided up into six different geologic provinces: