The United States, the full name is the United States of America, the capital is Washington, located in the central part of North America. The residents are mostly Christian and Catholic, the common language is English.

U.S. is a highly developed modern country, its GDP ranks first in the world for many years. U.S. is highly developed in science and technology, leading the world in weapons research, nuclear industry, space industry, materials science, computers, medical treatment and other domains.

The U.S. has the most powerful military in the world, and it is one of the world's largest agricultural exporters.

The U.S. Major cities include: New York, Washington, Los Angeles, Chicago, Philadelphia, San Francisco, Boston, Detroit, etc.