The major cause of the French and Indian War was A. DISAGREEMENTS BETWEEN THE FRENCH AND BRITISH OVER LAND CLAIMS AND THE FUR TRADE.
By the mid-18th century, both the British and French wanted to extend their colonies in North America to the land west of the Appalachian Mountains. The land was known as the Ohio Territory. Both British and French already established fur traders doing business with Native Americans and pioneers living on the frontier. Because both sides want to monopolize the fur trade in that area and expand their colonies, they underwent numerous assaults against each other.
The disagreement escalated and eventually resulted to the French and Indian War. A world war that raged seven years involving all European powers.