If you want to enter a foreign country you do. The passport isn't for leaving the country of citizenship. Its for entry into foreign countries. Even some cruise lines require a passport. To get back into the country you also need one. All American citizens now need a passport.
You don't need a passport to leave-- you need the passport to get back in. Foreign countries are likely to require a passport in place of a visa.
No.
Don't leave home without it.
He should be able to leave as long as he has his passport from that country.
in order to leave or return the US you must have a passport.
It is still possible to cross the US border into Canada or Mexico with only a drivers license and thus without a passport.
You need a passport to leave and enter countries. It used to be different before 9/11.
NO
To get on a airplane alone you must be 16 with ID and a passport. I am not sure if a passport would be issued to a 16 year old without a parents signature and some sort of letter or permission by the parent to leave the country.
No. They only need a passport when they leave the US.
If you have valid photo ID, you can travel in the US to other Continental states without a greencard. However, you will not be able to leave the country without passport in hand.
I guess you mean "passport". No, without a valid passport you cannot leave Mexico.
none. he need a passport