In this paper growth rates, marriage patterns, fertility, mortality, population composition and urbanization in England and her American colonies in the seventeenth and eighteenth centuries are compared. The purpose is to see whether the colonists perpetuated English demographic patterns in the New World, or whether new environments led to new behaviour. The results are derived from numerous local studies, often based on family reconstitution. Taking into account regional variations in America, colonial demographic patterns were quite different from those in the mother country.