It is fitting that the second epochal event that Adam Smith linked to Columbus's voyage of 1492 was the discovery by Portuguese navigators of a sea route from Europe to Asia around the southern tip of Africa. The European conquest of America began as an offshoot of the quest for a sea route to India, China, and the islands of the East Indies, the source of the silk, tea, spices, porcelain, and other luxury goods on which international trade in the early modem era centered. For centuries, this commerce had been conducted across land, from China and South Asia to the Middle East and the Mediterranean region. Profit and piety—the desire to eliminate Islamic middlemen and win control of the lucrative trade for Christian western Europe—combined to inspire the quest for a direct route to Asia.
At the beginning of the fifteenth century, one might have predicted that China would establish the world’s first global empire. Between 1405 and 1433, Admiral Zheng He led seven large naval expeditions in the Indian Ocean. The first convoy consisted of 62 ships that were larger than those of any European nation, along with 225 support vessels and more than 25,000 men. On his sixth voyage, Zheng explored the coast of East Africa. China was already the world’s most important trading economy, with trade routes dotting the Indian Ocean. Zheng’s purpose was not discovery, but to impress other peoples with China’s might. Had his ships continued westward, they could easily have reached North and South America. But as a wealthy land-based empire, China did not feel the need for overseas expansion, and after 1433 the government ended support for long-distance maritime expeditions. It fell to Portugal, situated on the western corner of the Iberian Peninsula, far removed from the overland route to Asia, to take advantage of new techniques of sailing and navigation to begin exploring the Atlantic.
The development of the caravel, a ship capable of long-distance travel, and of the compass and quadrant, devices that enabled sailors to determine their location and direction with greater accuracy than in the past, made it possible to sail down the coast of Africa and return to Portugal. Portuguese seafarers initially hoped to locate the source of gold that for centuries had been transported in caravans across the Sahara Desert to North Africa and Europe. This commerce, which passed through the African kingdom of Mali on the southern edge of the Sahara, provided Europe with most of its gold. Around 1400, it rivaled trade with the East in economic importance. And like trade with Asia, it was controlled by Muslim merchants.
In the fifteenth century, the world known to Europeans was limited to Europe, parts of Africa, and Asia. Explorers from Portugal sought to find a sea route to the East in order to circumvent the Italian city-states and Middle Eastern rulers who controlled the overland trade.