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delegacion (district), west-central Federal District, central Mexico. It lies along the Magdalena River near Cerro Ajusco. Although once simply the commercial centre for the cereals, beans, fruits, and livestock produced in the surrounding area, Magdalena gained prominence as the site of a battle (Aug. 19-20, 1847) in the Mexican War (1846-48) that enabled the U.S. general Winfield Scott to advance on Mexico City. It is now a residential and industrial neighbourhood of the federal capital, forming part of the Mexico City metropolitan area. Pop. (1990 prelim.) 195,000.