It is a large country in North America. It's a union of 50 individual states that act together as one whole country. Each state has its own government and laws, but they also follow bigger laws set by the national government in Washington D.C., the capital city.

Examples:

1. Who is the president in U.S.A. right now?
2. Many international students choose to study in the USA to learn.
3. The Statue of Liberty is a famous landmark in the USA.