美國允許多重國籍的嗎？ 美國入籍宣誓誓詞

I hereby declare on oath that I absolutely and entirely renounce and abjure  all allegiance and fidelity to any foreign prince potentate state  or sovereignty of whom or which I have heretofore been a subject or citizen;  that I will support and defend the Constitution and laws of the United  States of America against all enemies foreign and domestic; that I will  bear true faith and allegiance to the same; that I will bear arms on  behalf of the United States when required by the law; that I will perform  noncombatant service in the Armed Forces of the United States when required  by the law; that I will perform work of national importance under  civilian direction when required by the law; and that I take this  obligation freely without any mental reservation or purpose of  evasion; so help me God.

我在這裏鄭重宣誓：完全放棄我對以前所屬任何外國親王、君主、國家或主權之公民資格及忠誠，我將支持及護衛美利堅合眾國憲法和法律，對抗國內和國外所有的敵人。我將真誠效忠美國。當法律要求時，我願為保衛美國拿起武器；當法律要求時，我會為美國做非戰鬥性之軍事服務；當法律要求時，我會在政府官員指揮下為國家做重要工作，我在此自由宣誓，絕無任何心智障礙、借口或保留，請上帝幫我。

美國允許多重國籍的嗎？