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In 1850, America's plantation economy reigned supreme. U.S. cotton dominated world markets, and American rice, sugarcane, and tobacco grew throughout a vast farming empire that stretched from Maryland to Texas. Four million enslaved African Americans toiled the fields, producing global commodities that enriched the most powerful class of slaveholders the world had ever known. But fifty years later--after emancipation demolished the plantation-labor system, Asian competition flooded world markets with cheap raw materials, and free trade eliminated protected markets--America's plantations...

The Mekong Delta of Vietnam is one of the most productive agricultural areas in the world. The Mekong River fans out over an area of about 40,000 sq kilometers and over the course of many millennia has produced a region of fertile alluvial soils and constant flows of energy. Today about a fourth of the Delta is under rice cultivation, making this area one of the premier rice granaries in the world.

The Delta has always proven a difficult environment to manipulate, however, and because of population pressures, increasing acidification of soils, and changes in the Mekong's flow,...

The Mekong Delta of Vietnam is one of the most productive agricultural areas in the world. The Mekong River fans out over an area of about 40,000 sq kilometers and over the course of many millennia has produced a region of fertile alluvial soils and constant flows of energy. Today about a fourth of the Delta is under rice cultivation, making this area one of the premier rice granaries in the world.

The Delta has always proven a difficult environment to manipulate, however, and because of population pressures, increasing acidification of soils, and changes in the Mekong's flow,...