In this May 19, 2011 photo, assembly line workers Dave Zamora, left, and Steven Saleem work on a pre-production Chevrolet Sonic at the General Motors Orion Assembly plant in Orion Township, Mich. U.S.... more 
In this May 19, 2011 photo, assembly line workers Dave Zamora, left, and Steven Saleem work on a pre-production Chevrolet Sonic at the General Motors Orion Assembly plant in Orion Township, Mich. U.S. manufacturing activity expanded in May at the slowest pace in 20 months, the latest sign that the sharp rise in energy prices is hampering economic growth. less 
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Associated Press | Photo By Paul Sancya
Wed, Jun 1, 2011 10:27 AM EDT