yes * CURRENTLY:
U.S. citizens need to present either (a) a passport, passport card (available in spring 2008), or WHTI-compliant document; or (b) a government-issued photo ID, such as a driver's license, along with proof of citizenship, such as a birth certificate. * LATER:
On June 1, 2009, the U.S. government will implement the full requirements of the land and sea phase of WHTI. The proposed rules require most U.S. citizens entering the United States at sea or land ports of entry to have a passport, passport card, or WHTI-compliant document. Note: The passport requirement does NOT apply to U.S. citizens traveling to or returning directly from a U.S. territory. source: http://travel.state.gov/travel/cbpmc/cbpmc_2223.html
Depends on what country you're travelling from.
No, a Mexican citizen cannot travel to Mexico without a passport.
No, a US citizen cannot travel internationally without a passport.
No. A passport is required to travel internationally. However, there are some exceptions. For example, if you're an American citizen on a cruise that goes to Mexico, a passport is not required but a birth certificate and ID is. However, if you're an American citizen on a flight to Russia, then yes, a passport is required.
Not if you are a US citizen. If you are a citizen of the country, you can travel to any place part of the country without a passport.
Yes, if you are a U.S. citizen, you can travel to Florida without a passport as it is a domestic destination within the United States.
NO.
No, but you do need a valid passport.
Yes, you meed a passport whenever you travel!
You don't need a passport to travel within the continental United States, even if you are not a citizen.
You must always use a valid American passport when entering and departing the US even if you are a dual citizen.
Andaman and nikobar
You can if you are a US Citizen and are entering from the US.