GM's U.S. Blues

The automaker enjoyed a solid second quarter, but it still needs to win over U.S. unions and win back U.S. buyers

For the second week in a row, a U.S. auto company announced a profitable second quarter. Just a week after Ford (F) surprised Wall Street with a profit for the second quarter, rival General Motors (GM) doubled investor expectations with an $891 million profit. But there are continuing warning signs that Detroit has a lot of work to do.

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