The beginning of major hostilities between the American colonists and Great Britain, the displacement of Native American tribes and the destabilization of the French monarchy are three major effects of the French and Indian War. This war took place between 1754 and 1763.
To pay for the war, the British government imposed new taxes on the colonists. The colonists disliked these new taxes, especially because they did not have their own representatives in the British Parliament. Friction over these taxes eventually flamed into the American Revolution.
The French government also spent heavily on the war. The debts that the monarchy incurred fighting in this war weakened the king's position, making his absolute monarchy vulnerable to rebellions by the growing middle class. These tensions led to the French Revolution.
As English colonists began to flood into territories taken from France, they displaced the Native Americans.