The United States of America is the third most populous country in the world, and the fourth largest by total area. With a population of over 318 million, the country is ethnically diverse and has the largest economy in the world. The country’s growth slowed down after the 9/11 attacks and the recession in 2009 added to that as the economy contracted significantly. However, the economy is now moving on steady course forward thanks to increase in business investment, consumer expenditure and substantial decrease in unemployment.