In The Post-American World, Fareed Zakaria explores China's missed opportunity:
In 1492, as everybody knows, Christopher Columbus set sail on one of the most ambitious expeditions in human history. What is less well known is that eighty-seven years earlier a Chinese admiral named Zheng He began the first of seven equally ambitious expeditions. Zheng's ships were much bigger and better constructed than those of Columbus, or Vasco da Gama, or any of Europe's other great fifteenth and sixteenth-century seafarers. On his first trip, in 1405, he took 317 vessels and 28,000 men, compared with Columbus' 4 boats and 150 sailors. The largest vessels in the Chinese fleet, the "treasure ships," were over four hundred feet—more than four times the length of Columbus' flagship, Santa Maria—and had nine masts. Each required so much wood that three hundred acres of forest were felled to build a single one. There were ships designed to carry horses, supplies, food, water, and, of course, troops. The smallest vessel in Zheng's flotilla, a highly maneuverable five-masted warship, was still twice as large as the legendary Spanish galleon.
The Chinese ships were constructed with special woods, intricate joints, sophisticated waterproofing techniques, and an adjustable centerboard keel. The treasure ship had large, luxurious cabins, silk sails, and windowed halls. All were constructed on dry docks in Nanjing, the word's largest and most advanced shipbuilding port. In the three years after 1405, 1,681 ships were built of refitted at Nanjing. Nothing remotely comparable could have happened in Europe at the time.
Size matters. These massive fleets were meant to "shock and awe" the inhabitants of the surrounding area, making clear the power and reach of the Ming dynasty. On his seven voyages between 1405 and 1433, Zheng traveled widely through the waters of the Indian Ocean and around Southeast Asia. He gave gifts to the natives and accepted tributes. When encountering opposition, he did not hesitate to use military might. On one voyage, he brought back a captured Sumatran pirate; on another, a rebellious chief from Ceylon. He returned from all of them with flowers, fruits, precious stones, and exotic animals, including giraffes and zebras for the imperial zoo.
But Zheng's story ends oddly. By the 1430s, a new emperor had come to power. He abruptly ended the imperial expeditions and turned his back on trade and exploration. Some officials tried to keep the tradition going, but to no avail. In 1500, the court decreed that anyone who built a ship with more than two masts [the size required to go any distance at sea] would be executed. In 1525, coastal authorities were ordered to destroy any oceangoing vessels they encountered and throw the owner in prison. In 1551, it became a crime to go to sea on a multimast ship for any purpose. When the Qing dynasty came to power in 1644, it continued this basic policy, but it had less faith in decrees: instead, it simply scorched a 700-mile-long strip of China's southern coast, rendering it uninhabitable. These measures had the desired effect: China's shipping industry collapsed. In the decades after Zheng's last voyage, dozens of Western explorers travelled to the waters around India and China. But it took three hundred years for a Chinese vessel to make its way to Europe—on a visit to London for the Great Exhibition of 1851.pp.49-51