[Sidenote: Absence of towns.] A glance at the map of Virginia shows to what a remarkable degree it is intersected by navigable rivers. This fact made it possible for plantations, even at a long distance from the coast, to have each its own private wharf, where a ship from England could unload its cargo of tools, cloth, or furniture, and receive a cargo of tobacco in return. As the planters were thus supplied with most of the necessaries of life, there was no occasion for the kind of trade that builds up towns. Even in comparatively recent times the development of town life in Virginia has been very slow. In 1880, out of 246 cities and towns in the United States with a population exceeding 10,000, there were only six in Virginia. [Sidenote: Slavery] The cultivation of tobacco upon large estates caused a great demand for cheap labour, and this was supplied partly by bringing negro slaves from Africa, partly by bringing criminals from English jails. The latter were sold into slavery for a limited term of years, and were known as "indentured white servants." So great was the demand for labour that it became customary to kidnap poor friendless wretches on the streets of seaport towns in England and ship them off to Virginia to be sold into servitude. At first these white servants were more numerous than the negroes, but before the end of the seventeenth century the blacks had come to be much the more numerous. [Sidenote: Social position of settlers.] In this rural community the owners of plantations came from the same classes of society as the settlers of New England; they were for the most part country squires and yeomen. But while in New England there was no lower class or society sharply marked off from the upper, on the other hand in Virginia there was an insurmountable distinction between the owners of plantations and the so-called "mean whites" or "white trash." This class was originally formed of men and women who had been indentured white servants, and was increased by such shiftless people as now and then found their way to the colony, but could not win estates or obtain social recognition. With such a sharp division between classes, an aristocratic type of society was developed in Virginia as naturally as a democratic type was developed in New England.