The United States of America (USA or U.S.A.), is a federal republic consisting of 50 states
(including Alaska and Hawaii), 16 territories, and a federal district.
With around 316 million people, the United States is the fourth-largest in total area, and third in population.
It is one of the world's most ethnically diverse and multicultural nations. The geography and climate of the U.S. is also
extremely diverse, with deserts, plains, forests, and mountains that are home to a wide variety of wildlife.
The United States emerged from World War II as a global superpower, the first country with nuclear weapons, and a permanent
member of the United Nations Security Council.
The United States has the world's largest national economy, with an estimated GDP of $16.2 trillion (2013). The economy is
fueled by an abundance of natural resources, a well-developed infrastructure and high productivity. USA continues to be one
of the world's largest manufacturers. The country has the foremost economic and military power, a prominent political and
cultural force in the world, and a leader in scientific research and technological innovation.
Tourism in the United States is a large industry that serves millions of international and domestic tourists yearly.
Tourists visit the US to see natural wonders, cities, historic landmarks and entertainment venues. Tourists spend more money
in the United States than any other country in the world.