United States:
The United States of America is a federal constitutional country, which consists of Washington, D.C., 50 states, Guam and many other overseas territories. Its main part is located in central North America. The first edition of the CIA's "World Survey" was from 1989 to 1996. The United States has a total area of 9.373 million square kilometers and a population of 333 million. It is an immigrant country with a common English. The United States was the first place where Indians lived. At the end of 15, Spain, the Netherlands, France and Britain immigrated here one after another. ?