Final answer:
The French and Indian War was caused by border tensions between France and Britain in the Ohio River Valley.
Step-by-step explanation:
The French and Indian War was caused by border tensions between France and Britain, particularly in the Ohio River Valley. The physical proximity of France and Great Britain created competition for land and resources in the region. When British colonists, led by George Washington, tried to expand into the Ohio River Valley, the French responded by building forts to stake their claim. This rivalry and competition for territory ultimately led to the French and Indian War.