A U.S. passport is a very important document for proof of US citizenship. A person may be a U.S. citizen by birth, naturalization, or derivation of citizenship.
The primary purpose of a U.S. passport is to be able to travel to foreign countries, proof as the identity of a person who is a US citizen, proof of employment authorization in the U.S., to display visa stamps of various countries, and to display the exit/entry stamps as appropriate.
Related links:
US citizenship through naturalization
US passport
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