Superman and the necessity of a national American identity

In 2011, after 899 issues and 73 years of publication, Superman, the most famous American comic book character, announced that he was renouncing his American citizenship.
"I intend to speak before the United Nations tomorrow and inform them that I am renouncing my U.S. citizenship," Superman announces. He then adds, in reference to his famous motto: "Truth, justice and the American way — it's not enough anymore."