Permanent Resident vs. Citizen: What's the Difference ...
https://www.alllaw.com/articles/nolo/us-immigration/permanent-resident-vs-citizen-difference.html
Permanent residents remain the citizen of another country. So every time you travel outside the United States, you must carry the passport of that country with you, as well as your U.S. green card. You will use your green card to reenter the United States. There are important limitations on lawful permanent residents’ rights, however.
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