The development of the tobacco economy in the Chesapeake colonies led the Virginia Company to develop a labor system to meet their particular needs. Large numbers of workers were needed to clear new tobacco fields and others were required to tend and harvest the crop. Fortuitously, the American labor shortage existed at the same time that widespread unemployment gripped England. A worker seeking a new start in America signed an indenture agreement,* which stipulated that he was borrowing money for his transportation and would repay the lender by performing labor for a set period. Skilled laborers were often indentured for four or five years, while unskilled workers often had to remain under the master’s control for seven or more years. In addition to receiving passage to America, the servant would be provided with food, shelter, and clothing. Perhaps as many as 300,000 workers migrated under the terms of these agreements. Most were males, generally in their late teens and early twenties, but thousands of women also entered into these agreements and often worked off their debts as domestic servants. Treatment of indentured servants differed greatly from one master to another. In some areas, slaves were treated more humanely because they were regarded as lifetime investments, while the servant would be gone in a few years. The length of servitude could legally be lengthened in cases of bad behavior, especially for those workers who ran away or became pregnant. Servants fared better than slaves in other respects; they had access to the courts and were entitled to own land. Masters retained their right to prohibit their servants from marrying and had the authority to sell them to other masters at any time. At the end of the service period, many workers were provided with their “freedom dues” — often consisting of new clothes, farm tools and seed; on rare occasions the worker would receive a small plot of land. One variant of this labor system was the use of "enforced servitude." Vagrants, war prisoners, and minor criminals were shipped to America by English authorities, then sold into bondage. There were success stories of people who had started as indentured servants and later became prominent citizens, but the number was probably very small. The lingering dark side to the practice was of those who completed their service, but could not afford to buy land and were unable to find employment. The result was hundreds of rootless men in many frontier areas. This fueled movements of social unrest, including Bacon’s Rebellion in Virginia, in 1676. During the 1670s, the flood of servants coming to America slowed. Economic conditions in England had improved and fewer people were willing to take the risk of starting from scratch in a faraway land. The plantation owners in the Chesapeake region, still badly in need of workers, turned increasingly to slavery to keep their operations functioning.