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You can buy a pile of them at any market today for pocket change. But four hundred years ago, a single vine changed the fate of an empire. I’m talking about the sweet potato. In Southern Fujian, they still call it “golden root.” In 1593, a Fujianese merchant named Chen Zhenlong smuggled a sweet potato vine back from Luzon in the Philippines — hidden in the ropes of his ship’s cabin. The Spanish had forbidden its export. That vine reached Fuzhou, where Governor Jin Xuemeng turned it into an institutional campaign that would transform millions of lives. ...

Have you ever wondered — what if a county was not created to make life better, but to make escape impossible? In 1452, the 3rd year of Jingtai in the Ming Dynasty, a new county appeared in central Fujian. Its name: Yongan — “Eternal Peace.” But it was born from anything but peace. I want to share a story with you: Yongan wasn’t a place that grew gradually. It was carved out of a battlefield, surgically, by imperial decree. ...

Quanzhou Yacheng (Tang dynasty administrative core, near Weiyuan Tower) Luocheng (Southern Tang expansion that defined Quanzhou’s layout) Suqing Gate (West gate, adjacent to the Customs House) Deji Gate (South gate, primary Song-Yuan trade gateway on the Jinjiang River) Chaotian Gate (North gate, overland highway to Fuzhou) Jinjiang River (Natural moat and the inland gateway of the Maritime Silk Road) Have you ever seen a city that planted its own walls? ...

A harbor with an outlet merely 2.6 kilometers wide, yet an inland sea area of 614 square kilometers. Water depths of 10 to 50 meters — enough for 10,000-ton vessels to sail freely. This is Sandu’ao. Geologists call it “one of the world’s rarest natural harbors.” But for five centuries, this world-class deep-water port was repeatedly sealed — from Ming Dynasty patrol boats, to the Qing Great Clearance, to scuttled ships during the War of Resistance. ...

Imagine a county whose territory was carved up repeatedly over centuries, leaving it with less than one-third of its original size. That is Youxi. In the 29th year of Kaiyuan of the Tang Dynasty (741 AD), it entered history with a vast territory of 3,424.64 square kilometers. Five hundred years later, this land had been split into three pieces, giving birth to two new counties: Yongan and Datian. I opened the Youxi County Gazetteer, and between its yellowed pages lay the story of a “mother county” torn apart. ...

In Southern Fujian, the earth has not always been a silent foundation. Zhangzhou — an ancient city famed for the prosperity of Moon Harbor — was repeatedly shaken by tremors deep within the crust. In 1445, the earliest documented earthquake struck the prefectural city. In 1591, city walls collapsed and the earth split open. In 1604, a magnitude 8.0 quake off the coast of Quanzhou rocked the entire region. I opened the Wanli Zhangzhou Prefecture Chronicle and the Zhangzhou Seismological Chronicle. In the volume on “Portents and Disasters,” I saw how our ancestors captured the “turning of the Earth Dragon” with cold, precise numbers. ...

Can you imagine two stone towers surviving a Magnitude 8.0 earthquake? No reinforced concrete. Just granite. Built 800 years ago, without computers or formulas for structural mechanics — relying only on the hands and eyes of craftsmen. The Twin Pagodas of Quanzhou’s Kaiyuan Temple — Zhenguo and Renshou — did exactly that. On December 29, 1604, a Magnitude 8.0 earthquake struck Quanzhou Bay. Countless houses inside and outside the city collapsed. Even the government office buildings were destroyed. But the two stone pagodas stood amid the ruins, unmoved. Not luck. Design. ...

Did you know that some counties in Fujian were literally “pieced together” from scraps of their neighbors? Not just one. In the mountains of central Fujian during the Ming Dynasty, at least three counties were carved out—cut from the flesh of a “mother county,” stitched together at the borders, and stamped with a new name. The deepest cut went into Youxi County. Established in 741 AD during the Tang Dynasty, Youxi covered over 3,400 square kilometers in the early Ming—more than twice the size of modern-day Xiamen. But in 1452 and 1535, the imperial court took a knife to it: first slicing off four districts (Du) to create Yongan, then carving out another twelve to create Datian. ...

Have you ever wondered how a tidal flat, submerged by seawater for millennia, could be turned into fertile farmland that sustains thousands? This is not a myth. This is what the people of 16th-century Zhangzhou actually did. In the late Ming period, the people of Southern Fujian faced a brutal choice: inland lay endless dense mountain forests, every inch of which had already been claimed by clan lineages. Offshore lay the roaring tidal flats, submerged twice daily by the ebb and flow, offering vast stretches of unclaimed mud. ...

Do you know where Marco Polo’s “Greatest Port in the World” really was? Not Venice. Not Alexandria. It was Quanzhou. Europeans called it “Zayton.” In 1087 AD, the Northern Song court established the Maritime Trade Bureau (Shibosi) in Quanzhou. Before that, the city’s overseas trade was managed remotely from Guangzhou. One imperial decree, and Quanzhou became China’s first special economic zone. I’m Chuke. Today, I want to flip through the Quanzhou Prefecture Chronicles and the Quanzhou Customs Records, and see how this city managed global trade across two dynasties. ...