Canadian, American and European citizens can enter Mexico without additional requirements other than their passports.
U.S. citizens entering by car from Mexico are required to have their passports as well as other supporting documents. These include NEXUS, SENTRI and/or FAST.
Passports are generally used for Travel and as a form of valid Identification and a proof of nationality. You are admissible to a country when you hold a passport and the needed other documents to enter like the Visa.
You absolutely can. You should also exit the US on your Canadian passport if you do so.Canadian and Bermudian passports are the only passports that have visa-free access to the US and yet are not required to register for ESTA before their departure.
Canadian, American and European citizens can enter Mexico without additional requirements other than their passports.
For some islands in the Carribean, passports are necessary for Americans. More importantly though, passports are necessary for Americans to re-enter the US now, from any other country.
Even though the rest of the world recognizes Israel as a state, the UAE does not. An unhelpful answer - the correct answer is from the UAE Embassy in Washington DC and applies to US citizens with US passports: "All Americans with US passports valid for more than six months are welcome to enter the UAE, and no longer need to obtain a visa to enter the country if the duration of stay is less than one month. This includes US citizens with visas or entry stamps from other countries." This means you CAN enter the UAE with a US passport that bears a stamp from Israel.
The US Department of State issues US passports!
Canadian, American and European citizens can enter Mexico without additional requirements other than their passports.
Actual passports are not required if you are leaving the country by land or boat. However, passport cards are required in order for you to enter back into the US. Passport cards are similar to drivers licenses and cost less than actual passports.
Canadian and British passports are the only passports that are allowed to enter South Korea and visit up to six months.US was 30 days but after the VWP agreement of 2008 with South Korea, they extended it up to 90 days for US citizens.
Since Guam is part of the Unites States Teritory then no, not necessarily unless needed by the airline that you are to use for the travel. However, if you are not a US citizen then you need a passport to enter together with your Visa unless stated otherwise by their law and ntrance requirement.