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.