Losers rarely name wars, an exception being the conflict between Britain and China from 1839 to 1842, known bluntly ever since as the Opium War. To most Chinese, a century of humiliation began with this war, in which Westerners sought to force a deadly drug on an Asian people, and then imposed an unequal treaty that pried open their country and annexed the island that became Hong Kong.

In embarrassing truth, that is essentially what happened. As Hong Kong reverts to China at month's end, many of us for the first time may see a bit of history from a different end of the telescope. Yet a further point needs making. Even the authors of the Opium War were ashamed of it, and Western protests against it marked the beginning of a concern with international human rights that in a fresh turn embarrasses today's leaders in Beijing.

Along with the slave trade, the traffic in opium was the dirty underside of an evolving global trading economy. In America as in Europe, pretty much everything was deemed fair in the pursuit of profits. Such was the outlook at Russell & Company, a Boston concern whose clipper ships made it the leader in the lucrative American trade in Chinese tea and silk.

In 1823 a 24-year-old Yankee, Warren Delano, sailed to Canton, where he did so well that within seven years he was a senior partner in Russell & Company. Delano's problem, as with all traders, European and American, was that China had much to sell but declined to buy. The Manchu emperors believed that the Middle Kingdom already possessed everything worth having, and hence needed no barbarian manufactures.

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The British struck upon an ingenious way to reduce a huge trade deficit. Their merchants bribed Chinese officials to allow entry of chests of opium from British-ruled India, though its importation had long been banned by imperial decree. Imports soared, and nearly every American company followed suit, acquiring ''black dirt'' in Turkey or as agents for Indian producers.