美国这个单词英语怎么说？

美国:
1. United States
2. USA
3. America
4. American

Relative explainations:
<yankeedom> <Yankeeland> <us> <United States Of America> <U.S.A.> <U.S.> <u-s> <the States> <the United States> <beat generation> <Delmarva> <the U.S.A.> <home of the brave> <the United States of America [USA]> <the America> <the United States [US]>

Examples:
1. 比尔·盖茨是美国公民。
Bill Gates is an American citizen.
2. 是我们对美国说不的时候了。
It's time for us to say "No" to America.
3. 美国是一个西方国家。
America is a western country.
4. 你到美国是坐船还是坐飞机？
Are you going to America by boat or by plane?
5. 他每年都要为商务到美国去几次。
He makes several business visits to American every year.
6. 他说话带着美国英语口音。
He spoke with an American accent.
7. 你知道美国的三大电视网吗？
Do you know the three USA television networks?