The French established forts throughout North America to control the fur and grain trade, leading to conflicts with British colonists over territory. The French and Indian War erupted as the French and British fought for control of the Ohio River Valley and expanded into a global war. Though the British eventually defeated the French with reinforcements from Pitt, the Treaty of Paris angered American Indians by ceding land and colonial soldiers by poor treatment. This contributed to growing colonial unrest and resistance to British authority.