What would be the most likely geological feature that influenced the drawing of the proclamation of 1763?

The correct answer is Appalachian Mountains  While they do not run the entire length of the Proclamation Line of 1763, the Appalachian Mountains were the main reason for the Parliament's decision to create it after the Seven Years War. Parliament wanted to keep colonists on the eastern side for two reasons: to protect them from Indian attack and to keep an eye on colonists who might stir up dissent against the British Crown.