The General Motors Corporation reported a stunning second-quarter loss of $15.5 billion on Friday because of a dramatic decline in United States sales and charges for job cuts, plant closings and the falling value of trucks and sport utility vehicles.
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And in a move that symbolized the end of the S.U.V. era, Mr. Wagoner said that G.M. had begun a “strategic review” toward a likely sale of its Hummer brand.