We have done the same to mexico as we have to the rest of latin america. We have interferred in their politics and backed only leaders who will do US bidding and use our might to defeat anyone who dare disagree. Our school of americas and mercenarys (death squads) are utilized in Mexico just as they are in other parts of the world as well.
Its not their "culture" that placed them in the position they are in...its US dominance in the region and our faulty idea that its OUR RIGHT to dictate to them and interferre (with deadly force when neccessary).
Honestly just consider the oil Mexico has and its not hard to realize why the US interferres.
http://texascivilrightsreview.org/phpnuke/modules.php?name=News&file=article&sid=680
http://www.aztlan.net/future_us_invasion_of_mexico.htm
and lets look at NED and USAID activity in Mexico.
http://www.usaid.gov/locations/latin_america_caribbean/country/mexico/
Thats 33 million from just ONE of the agencies the US uses to interferre and corrupt peoples right to self-determine.
http://www.ned.org/grants/06programs/grants-lac06.html#mexico
You can choose mexico, they dont give a lump sum they just give various money amount to various "projects" and you can see them for yourself.
We are doing the SAME exact things to Mexico as we do to the rest and how lethal we get depends on how much they fight us.
There is also much evidence that Mexico suffered some of the same kind of voter tampering we had in the US (surprise surprise) and many legitimate voters were stripped of their right to vote and another SHOCK....they came from the poor districts and were believed to be more inclined to vote for the one the US govt wasnt backing.