In order to restore Chinese hegemony in Asia, Emperor Yongle sponsored seven naval expeditions commanded by Admiral Zheng He, whose voyages took place between 1405 and 1433. He was a Muslim from southwestern China who rose through the administrative ranks to become a trusted advisor of the emperor. For each journey he launched a fleet of vessels like the world had never seen before. The Chinese junks were huge with nine masts, by far the largest ships ever launched up until that point in history. They were far larger than the ships that Christopher Columbus was to sail only a few decades later. Altogether the ships traveled the Chinese seas to Southeast Asia, and on across the Indian Ocean to India, the Middle East, and Africa. Throughout his travels he dispensed lavish gifts, and he also dealt harshly with pirates and political leaders that tried to defy Chinese might. He returned to China with presents from his hosts and stories that awed the Chinese, especially Emperor Yongle. Zheng He's most famous gifts were destined for the imperial zoo - zebras and giraffes from Africa that drew crowds of amazed people who had never seen such animals before.

The main purposes of the voyage were twofold: to convince other civilizations that China had indeed regained their power and to reinstitute tribute from people that no longer gave it. The latter did not bring any income to China, mainly because the cost of the voyages and gifts was more than any revenue they stimulated.

Zheng He's voyages were halted in the 1430s when Emperor Yongle died. Confucian bureaucrats, who had little desire to increase China's interactions with other civilizations, gained control of the court and the new emperor, and refused to continue to finance the voyages. According to the new court, the money was needed to better protect the empire from its age-old problem: nomadic invasions from the west. The voyages and the Ming reaction to them provide good evidence for the pattern that was setting in: the impulse to trade and contact others v. the tendency to turn inward for fear of the negative effects on the Han Chinese.

• Profit from commercial operations - Geographically, Europe was on the outskirts of the established trade routes. The impractical nature of overland travel for Europeans was confirmed by the fact that the first European trade cities - Venice and Genoa - made their fortunes by sea travel. And so the Europeans set out to make their fortunes via water transportation.
• Spread of Christianity - True to its roots, Christianity had remained over the centuries a missionary religion. The Catholic Church took this responsibility seriously, and as a result, Europe was overwhelmingly Catholic by 1450. Once they began traveling to other lands, they aggressively promoted the spread of the Christian faith, so that their missionary motives were often as strong as their desire for profits.

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Portuguese Explorations

Portugal was the first European kingdom to explore other lands seriously. One reason was its geographic local on the Atlantic Ocean, with a long seacoast with good harbors. Another took the form of an often underrated historical figure, Prince Henry the Navigator. He wanted to increase Portugal's maritime influence and profits, and he also wanted to spread Christianity. From Portugal his ships ventured to the Strait of Gibraltar, where they seized the Muslim city of Ceuta, allowing Christian ships to travel safely between the Atlantic and the Mediterranean. Next Portuguese marines explored nearby islands, and eventually made their way down the coast of Western Africa.

Henry's influence was so great mainly because he started a school for navigators that trained some of the most famous and skilled mariners of the day. Two of his students solved an ancient mystery: Where is the southern tip of Africa? In 1488 Bartolomeu Dias had sailed around the Cape of Good Hope and returned to Portugal with the news. A few years later Vasco da Gama rounded the Cape, found the southern Swahili cities, and hired a Muslim guide that helped him to sail all the way to India. These voyages - though the ships traveled no further than those of Zheng He - were the beginnings of sustained European sea travel that eventually led to Europe's rise to power.

For most of the 16th century, the Portuguese dominated the Indian Ocean trade. How did they capture this old sea route that had been shared by Arabs, Persians, Indians, and Southeast Asians? The most important single answer is technological: they had superior weapons. Their ships were armed with cannons that they used so skillfully that their relatively small ships could overpower almost any other type of vessel. The Portuguese were intent on converting all that they met to Christianity, although they often did more harm than good, infuriating the natives by burning down mosques and/or forcing conversions.

Early Spanish Expeditions

Since the Portuguese dominated the Indian Ocean trade, other European kingdoms looked for other routes to the east, where they sought to capture some of the trade that so filled Portuguese pockets. Spain was one of the first to seek an alternate route when Queen Isabella and King Ferdinand sponsored the voyages of Italian sailor Christopher Columbus. Using maps devised by the Greek geographer Ptolemy, Columbus believed that the voyage west was possibly shorter than the Portuguese route from Europe around the tip of Africa and east. Ptolemy's maps were wrong, since they assumed that the circumference of the early was only 16,000 miles (as opposed to the actual 25,000), and Columbus of course landed in the Americas, "discovering" the new hemisphere for Europeans. He returned to Spain without the trade goods that he expected to find from the east, but he convinced the Spanish monarchs that he had landed in the islands off the Asian coast. On his subsequent voyages he explored more areas, but he never reached the mainland, nor did he ever publicly acknowledge that he had failed in his mission &endash; finding a new route to Asia.

During the 16th century the Portuguese slowly faded as a power while Spain claimed and kept more and more land in the western hemisphere. In 1519 a Spanish expedition led by Hernan Cortes marched to the Aztec capital of Tenochtitlan and defeated the great empire with only a few hundred soldiers. How? Two weapons helped a great deal - guns and disease. Gunpowder technology revolutionized the world during the 1450-1750 era, and the Amerindian Empires were among its first victims. Disease also made a big difference. Shortly after the Spanish arrived in Tenochtitlan, a smallpox epidemic broke out in the city that killed or incapacitated the Aztec army. A few years later Francisco Pizarro attacked and defeated the Inca. With the fall of those two empires the Spanish gained virtual control of Mesoamerica and South America, with the exception of Brazil, which fell on the Portuguese side of the line set by the Treaty of Tordesillas.

The cross-cultural exchange that developed along the Great Circuit is known as the Columbian Exchange, giving credit to the man that unwittingly started the whole thing. The Columbian Exchange included a huge number of products that changed diets and work habits around the world. Generally, the goods traded according to this pattern:

• Europe to the Americas - horses, cows, pigs, wheat, barley, sugar cane, melons, grapes
• Africa (includes Asian products) to the Americas - bananas, coconut palms, coffee, sugar cane, goats, chickens
• The Americas to Europe and Africa - corn, potatoes, tomatoes, sweet potatoes, pumpkins, squash, beans, pineapples, peppers, tobacco, chocolate

As a result of the new trade routes, the variety in many people's diet increased and resulted in better nutrition and health. Disease also was transferred with the most devastating effects on the Amerindian populations. They had no immunities to diseases that people of the eastern hemisphere had built up resistance to, such as measles, diphtheria, typhus, influenza, malaria, and yellow fever. Estimates vary, but all historians agree that the devastation cannot be overstated. Generally only one major disease that originated in the Americas traveled the other direction &endash; syphilis.

• Guns and gunpowder - Although the Chinese invented explosives, Europeans adapted them for guns. European metalwork advanced to the point that smiths were able to forge the first guns and cannons. Their accuracy was limited, but their power as weapons was awesome by the standards of the time. Guns and gunpowder allowed European explorers to intimidate and defeat virtually any foe.
• New ship technology - The European ships were not nearly as large as the Chinese junks, but their deep drafts and round hulls made them well suited for travel on the Atlantic Ocean.
• The compass - This technology was copied from the Arabs, who had earlier learned it from the Chinese. The compass pointed north, an important indication for ships traveling east to west.
• The astrolabe - An invention of the Arabs, the astrolabe allowed a sea captain to tell how far north or south his ship was from the equator.
• Cartography - European explorers recorded the new territories on maps, and the art of accurate mapmaking progressed significantly. One new map style created was the Mercator Projection that distorted land size seriously in extreme northern and southern areas. However, the projection was relatively accurate for the middle ranges, and those were the routes that navigators were following.