What was the main cause of the French and Indian War (1754-1763)

Causes of the French and Indian War. The French and Indian War began over the specific issue of whether the upper Ohio River valley was a part of the British Empire, and therefore open for trade and settlement by Virginians and Pennsylvanians, or part of the French Empire.

Explanation:

France was expanding into the Ohio River valley.

Explanation:

it was unclear whether the land was part of the British Empire or French Empire