Yes. All international travel generally requires a passport (often for exit control, as well as entry control), except for certain exceptions. Entry into Hong Kong for nationals is via ID card for example.
Yes, for any person to enter the border zone between the United States and Mexico a passport book or a passport card is required. In most cases when entering Mexico some form of a VALID and CURRENT US passport in good condition is required and the same is positively required when reentering the United States from Mexico.
Yes. Not a passport per se, but you need an ID to get into the plane.
does a citizen of Mexico need a passport to go from the us to Mexico and back? He is legal to be in us but not a us citizen.
yes
It is advisable to have a passport but a citizen of Mexico or the USA can do this with a drivers license.
Yes, you need a passport to go from the U.S. to Mexico because Mexico is not part of the U.S. If you were going to a U.S. territory and you were a U.S. citizen, you would not need a passport.
No. You need your US passport.
Yes, you do.
No not if your a United States citizen.
Yes, they do.
Yes, he does.
No. Both are in the United States. You do not need a passport to travel from state to state.
In none, with the assumption that you are already a US Citizen.