You know it's bad when...the net flow of Mexicans into the US has fallen so much that there is a high probability that it is now in reverse ending around forty years of inward migration. The Pew Hispanic Center notes that the standstill - after more than 12 million current immigrants have entered the US - more than half of whom are illegal - appears to be the result of many factors including a weakened US job and construction market, tougher border enforcement, a rise in deportations, growing dangers associated with border crossing, a long-term decline in Mexico's birth...