Can you keep your Tonga citizenship when you become a U.S. citizen?
Allowed
Yes, in general
Tongan citizens who become U.S. citizens keep their Tongan citizenship, since Tonga has allowed dual nationality since 2007.
What the law says
- Since 2007, Tonga has allowed dual nationality.
- Former Tongan citizens who lost nationality by obtaining another country's nationality (including American) could re-obtain Tongan nationality under the 2007 Nationality (Amendment) Act.
- Re-obtaining citizenship requires applying to the King, review by the Minister for Immigration, and swearing an oath of allegiance.
- Tongan nationals may not renounce their nationality.
“Since 2007, Tonga has allowed dual nationality.”
What about the U.S. side?
The United States allows dual citizenship. At the oath ceremony you promise to renounce allegiance to other countries, but U.S. law does not make you formally give up your other passport. The question is only whether Tonga lets you keep yours.
Source: Tongan nationality law (Wikipedia, summarized on 2026-11-11). Laws change — confirm with the Tonga embassy or consulate before your oath ceremony. This is not legal advice.
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