What were the causes of unrest in the American backcountry in the mid-eighteenth century?have support details.
The majority of the French and Indian War from 1754 - 63 was fought on the frontier--the edge of settlements in the Appalachian Mountains--so part of the unrest and discontent was caused by the direct threat during that conflict and how vulnerable those settlements were.
But I would say that most of the tension and unrest came from long-running conflicts with Native American tribes, and tension between settlers and the policies of England and the King. Most of those who lived on the frontier were Scotch-Irish, who held no love for the King as it was. They viewed restrictions on where they could settle or taxes they were asked to pay as just a continuation of what they had endured back in Ireland.