Why are illegal immigrants leaving?

The Boston Globe provides the answer:


According to the Center for Immigration Studies, which favors sharp immigration restrictions, the population of illegal aliens in the United States declined by almost 14 percent, or 1.7 million people, between the summer of 2007 and the spring of 2009. Analyzing Census Bureau data, researchers Steven Camarota and Karen Jensenius calculate that the number of immigrants entering the country illegally has fallen by one-third, while the number returning home has more than doubled. "Both increased immigration enforcement and the recession seem to explain this decline,''