After the French and Indian War, there was another war called Pontiac's Rebellion. After this rebellion the king proclaimed that no one could settle west of the Appalachian Mountains, through the Proclamation of 1763. He had set that land as an indian reserve. This angered the colonists because it wouldn't permit colonial expansion. This measure was supposedly taken because the indians feared that the colonists would take away their territory by expanding westward, and at the same time it was a way of keeping the colonies at the east coast (where it would be easier to be controlled by England). Defying this proclamation, the colonies started to settle west of the Appalachian Mountains around the 1770's.
Most indians sided with British and they were urged by England to attack the colonies. The indians eventually attacked, but the colonists wouldn't tolerate that. They started attackinh and killed neutral indians.They kept on disregarding the peace treaties they made with the indians. Little by little, the colonists managed to take more land.
After many fights with the British, the Patriots finally convince some Native Americans to abandon the British allies, allowing the Patriots to recapture a fort they had lost. Of course, not all Native Americans were willing to help the Patriots and they started attacking Patriot's frontieer posts in New York. The Patriots simply decided to stop trying to convince them and so they burned 40 Iroqouis towns. The Indians, in return, continued their attacks with awful consequences, forcing many Patriots to retreat to the east.