Yes, provided you have the visa issued at the US Embassy in Mexico City, and the package you are delivering is legal to introduce into US' soil (i.e: no drugs, weapons, nor explosive materials).
If the marriage is legal in Mexico, it will be held legal in the US. However, it is not legal for anyone under the age of 16 to get married in Mexico.
Yes, you can.
Having a passport and/or Visa is a legal way to enter the U.S. from Mexico.
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.
Oh yes, it is quite easy to drive to Mexico from the US and many people do.
you drive their
Yes, you can drive in the US with a Mexico license as long as it is valid and meets certain requirements, such as being in English or accompanied by an International Driving Permit.
The DVLA in the Uk carry the specific up to date legal requirements for number plates the US and other countries have their own sources
Sure.
It is 1,882miles (3,029 km) or about 1 day 5 hours to drive to the US/Mexico Border at Laredo.
No. Having a visa for the US doesn't grant you the possibility to enter Mexico; you need the corresponding visa from Mexico.