United States
In short
A large federal republic located primarily in North America, consisting of 50 states and a federal capital district.
In plain words
It is a massive country made up of many different states that follow one central government. It includes the main landmass between Canada and Mexico, plus Alaska and Hawaii.
A simple example
A person living in London is in the UK, while a person living in New York is in the United States.
Why it matters
It is one of the most influential nations in the world regarding politics, economy, and culture. Its decisions often affect global markets and international relations.
Easy to mix up
People often confuse the United States with the continent of North America or the country of Brazil when using the term 'America'.