The king did not allowed the colonist cross/settle the coast west beyond the Mountains of Appalachian. Although the colonists were unhappy with the proclamation line, since they believed it limited their freedom.
the proclamation of 1763 helped resolved a conflict with the Native Americans, and it also kept the colonists on the coast(where the British would be able to control them.
The British economic problem led to a lot of trouble,deeply in debt resulted on the war with France. The government planned to tighten the trade rules and tax the colonies.