The causes and effects of the French and Indian War The graphic organizer depicts the reasons for the conflict between French and English colonists, as well as how it affected the population. The causes of the war are listed in the left-hand boxes. Native Americans and the French were enraged by the arrival of English colonists on their land, which sparked the war. The right-hand boxes show the effects of the conflict and the British response. The conflict cost a lot of money, and native Americans had their territory taken away.