Question

What did Spain do after the American Revolution to discourage American settlements west of the Appalachian Mountains?

Answer 1

One of the things that Spain did after the American Revolution to discourage American settlements west of the Appalachian Mountains was to fortify many of their pre-existing forts in the area to make them seem more intimidating. 

Answer 2

 Answer; 
Spain placed a heavy tariff on American-made goods.
After the American Revolution to discourage American settlements west of the Appalachian Mountains, Spain placed a heavy tariff on American-made goods. 
Explanation; 
In 1763 King George III issued a royal proclamation that caused an outrage among the colonists. This Proclamation of 1763 closed lands north and west of the Appalachian Mountains to settlement. The goal of the British was to put a stop to conflicts that had arisen between the Native Americans and the colonists due to the French and Indian War.