which country is richest in the world?

         which country is richest in the world?

There are Many Countries Rich in the world
Like Qatar but Qatar Currency is high other hand high Currency  is problem for country.

Answer:

United States of America
Country
The U.S. is a country of 50 states covering a vast swath of North America, with Alaska in the extreme Northwest and Hawaii extending the nation’s presence into the Pacific Ocean. Major cities include New York, a global finance and culture center, and Washington, DC, the capital, both on the Atlantic Coast; Los Angeles, famed for filmmaking, on the Pacific Coast; and the Midwestern metropolis Chicago.
Capital: Washington, D.C.
Dialing code: +1
ISO code: USA
Population: 318.9 million (2014)
President: Barack Obama
Currency: United States Dollar
States: California, Hawaii, Florida, Texas, Massachusetts, Alaska, more