It has apparently become a complaint that the Obama administration has not been arresting and deporting enough illegal immigrants. According to Suzy Khimm, subbing in for Ezra Klein, while workplace raids have gone up 50% since the Bush administration, arrests and deportations have gone down 80%. This apparently has at least one former Bush official saying that Obama’s policy is “de facto amnesty” and they are “turning a blind eye to entire categories of aliens”. But no matter what Obama is doing, you would expect arrests and deportations to be going down right now, since immigrants are already deporting themselves, so to speak.

Contrary to the popular perception that illegal immigrants come here to lay in the shade and grow fat off of our generous welfare state that is freely available to illegal immigrants, they actually come here to work. Labor markets are thus a key determinant of immigration, and when labor markets get tight illegal immigrants leave.  This inexplicably colored chart from the Office of Immigrant Statistics tells the story:

Between 2000 and 2008 the illegal immigrant population grew by 3.1 million, from 8.5 to 11.6. From 2008 to 2009, the latest year for which I could find numbers, the population decreased by 800,000, from  11.6 million to 10.8 million. These numbers are as-of January 2009, and I’m betting that downward trend has continued over the last 19 months since this measurement was done.

While the decrease may not be huge percentage-wise, especially compared to the 80% decrease in arrests and deportations,  it is an indicator that the illegal population is currently experiencing a large amount of unemployment or underemployment.  This decrease in illegal immigrant employment would also partly explain why arrests and deportations are going down: since the raids target workplaces,  it’s harder to find them if more of them aren’t working.

It’s a lot easier to arrest and deport illegal immigrants when they are flowing into the country by the hundreds of thousands than when the population is decreasing by the hundreds of thousands. So maybe critics can lay off Obama on this and stop demanding that he actively destroy jobs in the middle of a recession.

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