I'm afraid I don't have anything worthwhile to contribute re. Mexico.
I'm aware of the oil aspects but that's it... never been down there, only know what I have read.

On a different note, this was posted today re peak oil and our agri-food system.
I think that the situation in Canada applies equally to USA: the first farmer is looking at biofuels, the second at local food supply.
My comments re. our energy dept being in denial on PO apply equally to your DoE.
My comments re Agriculture Canada apply equally to your USDA.
Until DoE sounds the alarm, USDA is unlikely to examine how US agri-food might function in a world without cheap energy.
Here is the link... please let me know what you think:
http://www.energybulletin.net/node/50800