Final answer:
The major source of conflict for Native American tribes in the French and Indian War was access to hunting grounds, leading them to support the British soldiers.
Step-by-step explanation:
The major source of conflict among native American tribes was access to hunting grounds. It was one of the reasons that they chose to support the British soldiers in the French and Indian War. The British soldiers' encroachment on the tribes' land and the reduction in gifts and supplies from the British worsened the relationships between the tribes and the settlers.