The Proclamation of 1763 was passed for one specific reason. (Please note I edited this question to reflect the correct year.) After the French and Indian War ended, the British gained huge amounts of land east of the Mississippi River from France. The colonists were very excited about this opportunity to get land. There was plenty of land available, and it wasn’t expensive. Land ownership was very important to the colonists. Sometimes, a person had to own land in order to be able to vote. However, the British were very concerned about attacks from the Native Americans. The Native Americans had joined with France in the fight against the British. The Native Americans did not want the British or the British colonists to move to these lands. The threat of violence was very high. Thus, the British passed this law to protect the colonists from attack by the Native Americans. The colonists didn’t like this law because it restricted opportunities for them to get land. This was the first of many laws that put the colonies on a collision course with Great Britain, eventually leading to the Revolutionary War.
The Proclamation of 1763 was passed by King George III, prohibiting the settlement of colonists past the Appalachian Mountains. The main reason for its existence was so that conflict and war between Native Americans and the colonists could be prevented.