Depends. If you are flying from Honolulu, you do not need a passport. However, Since Guam is technically part of the United States, you do need to show proof that you are from the US. (Photo ID, Drivers License, etc.) If you are flying from a foreign country, you will need to go through Customs.
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Yes you need a passport to go anywhere in Canada from the US.
Yes.
That would depend on your nationality. If you have US or Canadian citizenship, no, you just need some ID (such as driver's licence). For other nationalities, you may or may not need a passport. Eg, for Norh Koreans, they would need their passport :-)
Yes, especially for international flights. If you are just traveling in the U.S. then you only need a drivers license. But you will not make it through customs without a passport and if you need a visa in another country you need a U.S. passport.
No, you do not need a passport to travel to the US Virgin Islands. This information is available from the US Virgin Island's official website http://www.usvitourism.vi/