The motive that had sent Columbus to America and Vasco da Gama to India was the perennial first motive of all sailors since the beginning of things—trade. But while in the already populous and productive East the trade motive remained dominant, and the European settlements remained trading settlements from which the European inhabitants hoped to return home to spend their money, the Europeans in America, dealing with communities at a very much lower level of productive activity, found a new inducement for persistence in the search for gold and silver. Particularly did the mines of Spanish America yield silver. The Europeans had to go to America not simply as armed merchants but as prospectors, miners, searchers after natural products, and presently as planters. In the north they sought furs. Mines and plantations necessitated settlements. They obliged people to set up permanent overseas homes. Finally in some cases, as when the English Puritans went to New England in the early seventeenth 336}century to escape religious persecution, when in the eighteenth Oglethorpe sent people from the English debtors’ prisons to Georgia, and when in the end of the eighteenth the Dutch sent orphans to the Cape of Good Hope, the Europeans frankly crossed the seas to find new homes for good. In the nineteenth century, and especially after the coming of the steamship, the stream of European emigration to the new empty lands of America and Australia rose for some decades to the scale of a great migration. So there grew up permanent overseas populations of Europeans, and the European culture was transplanted to much larger areas than those in which it had been developed. These new communities bringing a ready-made civilization with them to these new lands grew up, as it were, unplanned and unperceived; the statecraft of Europe did not foresee them, and was unprepared with any ideas about their treatment. The politicians and ministers of Europe continued to regard them as essentially expeditionary establishments, sources of revenue, “possessions” and “dependencies,” long after their peoples had developed a keen sense of their separate social life. And also they continued to treat them as helplessly subject to the mother country long after the population had spread inland out of reach of any effectual punitive operations from the sea. Because until right into the nineteenth century, it must be remembered, the link of all these overseas empires was the oceangoing sailing ship. On land the swiftest thing was still the horse, and the cohesion and unity of political systems on land was still limited by the limitations of horse communications.