She became a US citizen.

她成了美国公民。

《牛津词典》

So I became a US citizen in 2008, which I am really happy about.

我在2008年成为了美国公民，为此我很高兴。

youdao

One of whom was born in Mexico, another in the Philippines, and the third is a US citizen.

其中一人出生在墨西哥，另外一人出生在菲律宾，第三位是美国公民。

youdao

because of this man here. He really wanted myself and all of us who participated in the program to get our degrees and learn what it meant to be a good citizen, and to be good parents and husbands and responsible human beings.

VOA: special.2010.06.10

If you're born in the United States you are by definition a natural born US citizen.

如果你出生在美国,那么你就是一个天生的美国人。

麻省理工公开课 - 计算机科学及编程导论课程节选

How do you know that your parents, at least one of your parents satisfies the definition? Well I've reduced the problem from am I a natural born US citizen to is one of my parents a natural born US citizen?

这是一个递归的定义，你怎么知道你的父母,至少其中一个是满足天生的美国公民,这个定义的呢？,我已经把我是一个天生的美国公民这个问题？

麻省理工公开课 - 计算机科学及编程导论课程节选

Unlike Sergio Garcia, Yen-Ling Rogers is a US citizen, a flight attendant and not famous.

FORBES: Move up http://i.forbesimg.com t Move down

He became a US citizen at 12, and opened his own recording studio in 1958.

BBC: US music producer and CD pioneer Phil Ramone dies

He said he planned to raise the case of a US citizen detained in North Korea.

BBC: Google head and former US governor in North Korea visit