Go have a look.
Gross Domestic Product (GDP) is a convenient way of measuring and comparing the size of national economies. Annual GDP represents the market value of all goods and services produced within a country in a year. Put differently:
GDP = consumption + investment + government spending + (exports – imports)
Although the economies of countries like China and India are growing at an incredible rate, the US remains the nation with the highest GDP in the world – and by far: US GDP is projected to be $13,22 trillion (or $13.220 billion) in 2007, according to this source. That’s almost as much as the economies of the next four (Japan, Germany, China, UK) combined.
The creator of this map has had the interesting idea to break down that gigantic US GDP into the GDPs of individual states, and compare those to other countries’ GDP.