Passport is travell document. It does not estublish citizenship. For example, if you wanna seek any benefits from government, say you wanna petition for your wife or run for office, you must show citizenship certificate, not a passport....
Nonsense. A U.S. passport is issued by the Department of State, a federal agency that is by law authorized to determine if someone is a U.S. citizen. In almost all situations, a U.S. passport is considered to be a proof of U.S. citizenship. Contrary to what you said, this includes petitioning a relative for an immigration benefit with USCIS (see the instructions for I-130, http://www.uscis.gov/files/form/i-130instr.pdf). Similarly, for the purposes of job eligibility verification, when filing W-4, a passport is an acceptable document for proving U.S. citizenship, while a certificate of citizenship is not. When you apply for a driver's license, voter registration, social security card, etc, a U.S. passport is considered a valid proof of U.S. citizenship. Different states have different rules for running for office but I have never heard of a state where a U.S. passport would not be considered sufficient. As I remember, for some federal elected offices one is required to be a citizen for a certain number of years; I could imagine that in such a situation a passport, while proving citizenship, may not be viewed as sufficient proof that someone has been a U.S. citizen for the required number of years; but that is a very rare situation unlikely to apply to most people.
Of course, there are additional benefits in having a non-expiring document certifying U.S. citizenship, such as a naturalization or a citizenship certificate. However, to say that a U.S. passport "does not establish citizenship" is bollocks.
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