How long did the Seven Year War last in Indian country?

The "Seven Year War" began in 1754 and blood was shed all over the Ohio Valley for many years. In 1764, the war began to fade as the Indians were running out of supplies to fight and the British were broke. However, the war did not end there. Fighting between British, French, and Indians lasted much longer and continued in the late 1770s. Sporadic fighting and raids broke out between these groups for years after the war had ended, thus leading up to the Indians joining the British to fight against the Americans in the Revolutionary War. When the fighting finally came to an end in 1815, the Indians had been fighting on their own land for over 60 years.

1. Did the Fort Pitt commander instigate continued fighting with the Indians and what was the catalyst he used?

2. Name two things the M.G. Amherst could have done differently to settle the land disputes in the Ohio Valley more peacefully than it turned out?