Answer:
French and Indian war
Step-by-step explanation:
CAUSE: The french and indian war began over the specific issue of whether the upper Ohio river valley was apart of the British empire, and therefore open for trade and settlement by Virginians and Pennsylvanians.
Effect: The British victory in the French and Indian War had a great impact on the British Empire. Firstly, it meant a great expansion of British territorial claims in the New World.