回复33楼:美国法律也是不承认双重国籍。 所以你不申请退出美国国籍就是美国人。
而美国个人所得税法非常霸道，按国籍征税。
只要你是美国人， 就的向美国交税。 住在月球上也一样。
美国可能是世界上唯一一个按国籍交税的国家。
美国脱离美国， 是有脱国籍税的。
好像是还很高。
所以那些申请美国国籍的富人要好好想想。
是不是应该入美国国籍。

A U.S. citizen may acquire foreign citizenship by marriage, or a person naturalized as a U.S. citizen may not lose the citizenship of the country of birth. U.S. law does not mention dual nationality or require a person to choose one citizenship or another. Also, a person who is automatically granted another citizenship does not risk losing U.S. citizenship. However, a person who acquires a foreign citizenship by applying for it may lose U.S. citizenship. In order to lose U.S. citizenship, the law requires that the person must apply for the foreign citizenship voluntarily, by free choice, and with the intention to give up U.S. citizenship.