The name 'United States of America' was first used in the Declaration of Independence in 1776.
The name was chosen to reflect the unity of the thirteen colonies that declared independence from Great Britain.
The name also emphasized the federal nature of the new country, with power divided between the national government and the individual states.
The name 'America' was already in use to refer to the entire continent, so the addition of 'United States' helped to distinguish the new country.
The name has been used ever since, even as the country has grown and expanded beyond the original thirteen states.
The name has become a symbol of American identity and unity, despite the many challenges and divisions the country has faced over the years.
Today, the name 'United States of America' is recognized around the world as a powerful and influential nation.