The French and Indian War started due to a conflict between Britain and France over control of the upper Ohio River Valley in North America. Both nations claimed this strategic and resource-rich region, which was critical for trade, settlement, and territorial expansion. The British settlers wanted to expand westward into the Ohio Valley, while the French sought to maintain control over the area to protect their trade routes and alliances with Native American tribes. This rivalry over territory and dominance in North America eventually led to open warfare between the two colonial powers, with Native American tribes supporting both sides. The French and Indian War was part of a larger global struggle between Britain and France for empire and influence.