8.1 Eurasian
The earliest Eurasian maritime expansion may have been the one that took the Eskimos, or their Palaeo- Eskimo forerunners, across the Bering Strait some five thousand years ago. Unlike earlier migrants who had used this route, they did not wait for an ice age; presumably they had canoes comparable to those they still used in recent times, or they may have crossed the sea while it was frozen over in winter. As we saw in chapter 5, the Eskimos possessed a material culture well adapted to the Arctic coastlands of North America, and they occupied this niche all the way across to Greenland. What they did not do on any scale was to move deeper into the Americas. Such a move would have required considerable change to their specialized Arctic culture; and it seems that the mere presence of hunter- gatherers to the south was enough to inhibit such an adaptation, or to limit its success. Thus the Eskimo expansion from northeast Asia was confined to the American Arctic.
At the east end of Eurasia long dugout canoes with some kind of outrigger were in use in Japan by the late Jomon period, at a time when deep-sea fish already formed part of the Japanese diet. By the sixteenth century A.D. both the Chinese and the Japanese had developed considerable maritime skills, and were using them energetically. In the Chinese case there was extensive seaborne trade in East and Southeast Asia, and this was supplemented in 1405, by a series of naval expeditions organized by the Chinese state and led by the eunuch Cheng Ho (Zheng He). While they lasted, these expeditions were large and ranged as far afield as East Africa. In the Japanese case the state played no comparable role, but trade, fishing, and piracy flourished even—or especially—in the absence of a strong central government. Japanese ships visited several destinations in Southeast Asia, and settlements were established there. Nearer home, Japanese pirates had menaced the coasts of Korea and China on and off for centuries. Their depredations climaxed in the 1550s; they had their bases in southern Japan, though many of the supposedly Japanese pirates of this time were in fact Chinese. Given this varied and active maritime scene, it would not have been at all surprising if East Asian shipping had sooner or later found its way to the New World or the Antipodes. But at the point at which the Portuguese appeared in East Asia, in the first half of the sixteenth century, there was no immediate prospect of this.
The maritime scene at the other end of Eurasia was also ancient. The Near Eastern farming package that reached Britain toward 4000 B.C. could have done so only by sea, since Britain had already been cut off from the Continent by rising sea levels some three thousand years earlier. Likewise, in the fourth to second millennia B.C., the communities of the Atlantic fringe constituted something like a single cultural zone linked by the ocean. At the same time the region had the advantage of easy communication with both the Mediterranean and the Baltic; the Mediterranean, as we have seen, was one of the world's most precocious regions of maritime development. The Pacific fringe of East Asia, by contrast, was less closely linked to the Indian Ocean, where interaction was in any case less intense; and access to the Sea of Okhotsk—should you happen to know where it is—did nothing for anyone. The Baltic, Atlantic, and Mediterranean scenes were all very active in the later Middle Ages, and the interaction of the Atlantic and Mediterranean was particularly fertile. It was to be personified in the Bart played by mariners from the city-states of northern Italy in the Iberian voyages of discovery. But perhaps more important was a confluence of maritime technology that arguably rendered the shipping of the Iberian Peninsula the most likely candidate to breach the traditional limits of Old World seafaring. The key development here was the caravel, which combined the maneuverability of the traditional galley with the relatively small crew of the traditional sailing ship. Yet we should not exaggerate the significance of this technological lead. We have a credible account of a circumnavigation of Africa by the Phoenicians around 600 B.C., and they could doubtless have crossed the Atlantic had they had a mind to.