Used VWP only for transit, now want to enter US for 90 days

I'm a French citizen with an approved ESTA.
I was flying from Thailand to Mexico with a 7hr transit in LA (had to go through border control and get a stamp). Indeed left US after a few hours.
I stay in Mexico for 3 weeks and really want to re-enter US (this time for traveling).
I'm not planning to work and have enough money (took a 1yr break from school for this trip, that's why I want to use my VWP for the max 90 days).
As I understand, currently I'll have 90 days minus my stay in Mexico for my re-entering.
My questions:
Is there something I can do/say/show so the border officer will grant me a new stamp for 90 days?
If so, better go by land or by air?
If not, is using the automated kiosks can help with something (maybe they give 90 days without messing with the Mexico/Canada issue)?
Best Answer
Salut alon !
Unfortunately, you cannot apply for a B2 visitor visa while in the US. You would have to go to a US consulate in Mexico (or some other country) and apply as a "Third Country National."
If you were to go to a consulate in Mexico, there is an application process here
http://mexico.usembassy.gov/visas/non-immigrant-visas/how-to-apply.html
Bonne chance, et courage !
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ESTA for Transit Purposes
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