Link to map :
The world today is very different than the world of the Late President Ronald Reagan. The laws that were passed during his administration were never enforced and the 'status' of the Mexican people were never improved. Mexico became a 'welfare state' to the USA and for the most part businesses in the USA liked it that way.
Southern California took on the 'culture' of illegal immigration and migrant workers to provide protections from harm while working for USA farmers. Today, they are still closely monitored for pesticide exposure.
The link above is a site that claims to keep track of the cost and numbers affiliated with illegal immigration in the USA.
It isn't just that, but, in the year 2010, we are nine years out from a very different world. The lack of resolve to the end of al Qaeda has made citizens feel vulnerable and more uncertain to their safety. Then there is the very real issue of the War South of the Border. It is real and to a greater extent that is the issue, both in illegal immigration that are better called refugees and the massive drug cartel operation into the USA.
