The Middle Colonies were four of the thirteen colonies in British America, located between the New England Colonies and the Southern Colonies. Along with the Chesapeake Colonies, this area now roughly makes up the Mid-Atlantic states (though with the notable exception of Vermont, which is reckoned with New England).
some key factors are economic interests, cultural values, the power of the federal government to control the states, and slavery. Hope this helped, please mark brainliest:)