18 Important facts to know about USA.

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1. The United States of America is also called the.USA, US, United States or sometimes America.

2. On July 4, 1776, the Declaration of
Independence was issued, establishing the United States of America.

3. The US is the 4th largest country in the world by land area and 3rd by population.

4. The US is a diverse country with a multicultural society. 
5. The US has the world's largest economy.

6. The US developed the first nuclear weapons, using them on the Japanese cities of Hiroshima and Nagasaki near the end of World War 2.

7. The Mississippi and Missouri Rivers combine
to form the longest river system in the US and the fourth longest in the world.

8. The tallest mountain the US is Mt McKinley, located in the state of Alaska it reaches 20,320 ft (6,194 m) above sea level.

9. Alaska was purchased from Russia in 1867 and is the largest state in the US by land area.

10. Hawaii is the most recent of the 50 states in the US (joining in 1959) and is the only one made up entirely of islands.

11. Most of the world's tornadoes occur in the Midwest region of the US known as Tornado Alley.

12. The most populated city in the US is New York City, followed by Los Angeles and Chicago.

13. English is the most commonly spoken
language in the US, followed by Spanish.

14. The first man to walk on the moon was American Neil Armstrong (July 21, 1969).

15. The US consumes more petroleum than any other country in the world.

16. The most popular team sports in the US are
American football, baseball, basketball and ice hockey.

17. Most people think that .com is the US top level domain, but this is actually a global one – the US one is .us, although it also controls .mil, .gov and .edu.

18. The US has no official federal language, although more than half of its states have English as their official language and most Americans speak English. Spanish is another major language, particularly in the South West