American colonies were under the direct supremacy of the British rule that was despotic. The Britishers showed their dominance by imposing heavy taxes on the American colonies that they were burdened.
British started to emerge as an industrialized economy and did not want Americans to adapt to the mechanization and automation which was in boom during that period.
Americans, who were an agricultural society taming animals and growing crops started to accrued wealth by establishing good trade relationships with the neighboring although disparities between the poor and the rich lingered during industrial revolution.
The French and Indian War altered the relationship between Britain and its American colonies because the war enabled Britain to be more "active" in colonial political and economic affairs. This happened by imposing regulations and levying taxes unfairly on the colonies, which caused the colonists to change their ideology from toleration to resentment toward Britain.