What is the name of America in the novel?

Many novels refer to the United States as Country M and China as China.

The United States of America (English: United States) 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. America is a highly developed capitalist country. In the two world wars, the United States and other allies won, and after decades of cold war, they became the only superpower after the disintegration of the Soviet Union, leading the world in the fields of economy, culture and industry. The White House, Silicon Valley, Wall Street, Hollywood, Broadway and so on in the United States enjoy world reputation.