U.S. citizens need to present either (a) a passport, passport card (scheduled to be in full production beginning in July 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.
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.
http://travel.state.gov/travel/cbpmc/cbpmc_2223.html
The above is true, but please read the actual events of going into and out of Tijuana
COMPLETELY CORRECT ANSWER as of July 2011: After reading about two dozen forums I was terrified to cross while on vacation. Here is my experience. A passport is required/desired, but Tijuana 1) does not check you going in (unless you look suspicious) 2) When leaving they have two distinct lines setup . . . One for those with WHT documents and another line for those without. The line for those without equates to those traveling with only basic documents i.e. (State issued drivers license and a birth certificate. When I came back across it was the easiest time I have ever had. My documents were looked at, I was asked maybe 2 questions and nothing was searched . . nothing at all . . . it was simple. BTW: I walked across, I would never driver across for many reasons.
Additionally: It is best to park across from the border gate at a cost of $8 and walk -in, it is safer and much quicker and easier. Should you choose to drive in, 1) make sure you have a Mexican Insurance policy. 2) Expect long waits to get back into the US.
Yes, Mexico is a foreign country, just like Canada.
Yes, you need a passport to go to any country outside of the U.S. and you need it to come back so they can verify that you are any American Citizen.
Going there isn't the problem ... coming backcould be a problem.
It's just best to carry your US Passport at all times when leaving the country.
Yes. And a visa.
yesss!
Yes, you do need your passport.
does my passport need to be in date to go to belfast
Do you need a passport to travel to Barcelona
Yes you do have to have a passport to go to Chile.
No. Going beyond border cities such as Tijuana, Mexicali or Juarez (the later is highly unadvised to visit), you will need a passport.
You need a passport to go anywhere.
You need a passport to go anywhere out of the country!
Yes, you need a passport to go to the Bahamas.
Yes, you do. A passport and a visa.
Yes, you do. Anytime you go into another country, you need a passport.
Yes, you do need a Visa to go to Mozambique with a Thai passport. Regardless of the passport country of origin, you will need a Visa to visit if you are not a native of Mozambique.
Yes, you definitely need a passport to go to Honduras on a cruise ship. More particularly, you will need a passport to re-enter the United States.