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I have dual citizenship, USA & a Caribbean island. If I enter the USA with only my Caribbean island passport, will they know I am a USA citizen?

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It is a good way to spend more time with the customs :) –  Amine May 8 at 19:33
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Not quite an answer but wouldn't you be asked for a visa with your other passport? Also, airlines transmit data on their passengers to US authorities. I don't know how these data are used but if you presented your US passport to the airline, it could be a way for CBP to notice you. Finally, as an alien, you would typically be asked about the purpose of the trip, etc. You might have to lie or reveal information that betrays your citizenship or at least raises suspicion. –  Relaxed May 8 at 21:09

1 Answer 1

As a US citizen, you must enter the USA under your American passport, not using any other, it's illegal to do otherwise.

I am an American citizen, but also have a foreign passport. Can I use my foreign passport to travel to the United States?

No. Under U.S. law, U.S. citizens must be in possession of a valid U.S. passport to enter or leave the United States. This is true even if you hold a passport from another country. If your U.S. passport has been lost or stolen, or if it has expired, you must apply to replace it before traveling to the United States.

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As for if they would know, that depends (there are ways that suggest it, including but not only place of birth, along with some databases), but Travel.SE policy is not to aid people in breaking the law so alas all we can say is you need to enter on your US passport...

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That's not the question, though... will they know the OP is a US citizen? –  Flimzy May 8 at 18:13
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(Although I think it's worth pointing out the legal issue, but the question should still be answered. The fact that they are asking the question probably implies they already understand the legal implications). –  Flimzy May 8 at 18:14
    
@Flimzy, frankly, I'm less confident regarding the understanding of the law. I don't understand it myself (had never even heard of it despite living here 30 years and leaving the country >4 times), but I'd bet the implication of the law is that, without your passport, how can customs know? Hopefully, they actually do have other means that someone else will speak to – e.g., checking citizenship records somewhere – but to me the law suggests they don't want the hassle and prefer to turn people away rather than make them wait for a lengthier process that involves more work on their end... –  Nick Stauner May 8 at 18:22
    
    
@Gagravarr: 1) The policy you quote is not nearly that hard-lined. 2) It's not necessary that the OP is trying to do something illegal. 3) There are times on this site when advice to do something possibly "illegal" has stood--in fact in a situation nearly identical to this one. –  Flimzy May 8 at 20:34

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