The United States of America is the world's third largest country in size. It is located in North America. There are 50 states and the District of Columbia. The United States is a nation of immigrants.The United States is described as a "mozaic" in which different cultures add their own colour to American culture.The United States is famous for its television and movies. President and Vice President of United States every four years. The president lives in the White House in the capital city of Washington In the early 17th century, people moved from Europe to the New World and started a new life.On July 4, 1776 they declared independence from Britain.