At the end of the seventeenth century approximately 200,000 people inhabited the British colonies in North America. The following century saw an explosion in numbers with the population doubling about every 25 years. The majority of these new immigrants were Scotch-Irish, Germans or African slaves. Between 1700 and the beginning of the American Revolution, approximately 250,000 Africans, 210,000 Europeans and 50,000 convicts had reached the colonial shores. The passage to America was treacherous by any standard. Many of the immigrants were too poor to pay for the journey and therefore indentured themselves to wealthier colonialists - selling their services for...