New Delhi: The United State of America is the world's largest national economy, with an estimated 2013 GDP of $16.2 trillion –22% of global GDP at purchasing-power parity, as of 2011.
It is the world's foremost economic and military power, a prominent political and cultural force, and a leader in scientific research and technological innovation.
It is one of the world's most ethnically diverse and multicultural nations.
Here are ten interesting facts to know about USA:
