I'm a strong believer in that old adage, "Where goods cross borders, soldiers don't." I certainly wouldn't call the border area a free trade zone, but the fact is that both countries profit from trade (both legal and the other kind). There really is little incentive for a border war.

Although, frankly, if Mexico wanted California, I'd be inclined to let them have it. Mexico can't run it any worse than the current state government.

Onward and upward,
airforce