4. Oklahoma
State GDP: $228 billion
Growth in 2010: 0.7%

Just a few years ago, Oklahoma boasted the fastest growing economy in the country, as its gross domestic product surged 6.6%.

But in 2010, that growth fell to a sluggish 1.0%.

Why? The state's oil industry grew so quickly with surging energy prices back in 2008, but during the recession and even into 2010, U.S. demand for energy declined.

Oil remains a strong sector for the state though, and now that energy demand is rising again, it's likely to help Oklahoma's economy pick up speed in 2011.

Last updated June 17 2011: 12:05 PM ET
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Check this interactive map to see how each state economy grew (or fell) last year. More

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