In the 2011 Index of Economic Freedom. The explanation:
The United States’ economic freedom score is 77.8, making its economy the 9th freest in the 2011 Index. Its score is 0.2 point lower than last year, reflecting deteriorating business freedom, trade freedom, government spending, and monetary freedom. The U.S. is ranked 2nd out of three countries in the North America region, and its overall score is well above the world and regional averages. ...
... the national government’s role in the economy has expanded sharply in the past two years, and the federal budget deficit is extremely large, with gross public debt approaching 100 percent of GDP. Passage in March 2010 of a massive health care bill significantly expanded the federal government’s control of the health care industry ....
Draw your own political conclusions.