In probably when the DI (Declaration of Independence) was signed it was the United States of America, so US is short for United States of America or it can be called USA.
Another answer:
Because US is short for USA, which stands for United States of America. Besides, there are many other countries in America. America was originally the name for the entire Western Hemisphere
The landmass of the US is called North America.
In 1878 the US was called the United States of America.
No the United States of America was never known as the United States of North America.
It's the abbreviation of The United States of America.
It was called the Confederacy or the Confederate States of America.
The USA is a country - its continent is called North America
The formal name of the US is the United States. It is also called the United States of America or just America.
The continent has never been called 'the US.' The continent is North America. North America has three countries, Canada, Mexico and the United States of America.
US = U.S.A. = United States of America They are called Americans
US = U.S.A. = United States of America They are called Americans
North America
Because the US stands for the United States, short for the United States of America.