The United States of America is by far the greatest country of all time. The GDP of the United States of America as March 2014 is ~17 trillion, and has been for many years, the single largest national economy on the planet. Only when you take a combinatio

The United States of America is by far the greatest country of all time. The GDP of the United States of America as March 2014 is ~17 trillion, and has been for many years, the single largest national economy on the planet. Only when you take a combinatio