I will not deny that, overall, the amount of aggregate economic output consumed by taxes in America is low compared to some countries. However, the difference if overstated. The way Kevin posts, you would think that the difference between the U.S. and most other countries is 20-25%. That is simply not true. Taxes consume around 30% of America's national output, while the EU sustains 42%. That is a large difference - 12%, to be precise - but it is not as large as some would have you believe.
(It should also be noted that America's per capita economic output is close to 50% higher than that of the EU's, and that we enjoy greater employment.)
Furthermore, America has "one of the highest corporate income tax rates in the industrialized world." To say that burden on the rich on this country is far less than in others is a pure, fallacious lie.
Here are some graphs: