Carl Bridenbaugh's study of colonial cities, Cities in the Wilderness, reveals a clear-cut class system. He finds: The leaders of early Boston were gentlemen of considerable wealth who, in association with the clergy, eagerly sought to preserve in America the social arrangements of the Mother Country. By means of their control of trade and commerce, by their political domination of the inhabitants through church and Town Meeting, and by careful marriage alliances among themselves, members of this little oligarchy laid the foundations for an aristocratic class in seventeenth century Boston.