What caused American colonists in different states to unify as one nation leading up to the French and Indian War?

Many different factors led to a highly evolved sense of unity and identity among the colonists. War and British negligence and victimization resulted mainly in colonial unification, while diversity and the distance between Europe and North America resulted in a distinctively American identity.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.