It early became evident that slavery was to be of no permanent economic advantage to any part of the colonies within the glaciated district, say from central New Jersey northward. In that portion of the coastal belt the state of the surface and the character of the crops alike tended to make the ownership of slaves unprofitable. The farms were necessarily small. They became in a natural way establishments worked by the head of the house, with the help of his children. Such other help as was needed was, in the course of two generations, readily had from hired white men and women. It was otherwise in the tobacco-planting region to the southward. The cultivation of that plant, to meet the extraordinary demands that Europe made for it, gave slavery its chance to become established in this country. But for that industry the institution would most likely have taken but slight root, and the territory as far south as North Carolina would have been in social order not very different from Pennsylvania, New York, and the New England settlements. But, owing to some peculiar, as yet unrecognized, adjustments of climate and soil, tobacco for pipes has a quality when grown in the Virginia district such as it has nowhere else in the world, and the world turned to smoking it with a disregard for expense that made each laborer in the field worth some hundred dollars a year. Moreover, the production of good tobacco requires much care, which extends over about a year from the time the seed is planted. Some parts of the work demand a measure of judgment such as intelligent negroes readily acquire. They are indeed better fitted for the task than white men, for they are commonly more interested in their tasks than whites of the laboring class. The result was that before the period of the Revolution slavery was firmly established in the tobacco-planting colonies of Maryland, Virginia, and North Carolina. It was already the foundation of their only considerable industry.