There have been about 340,000 babies born in the U.S. to illegal immigrants every year. During the same period, (circa 2008) there have been about 450,000 Black Americans aborted each year.
Obama and the social engineers have been working to pick up the pace of anchor baby production in recent years, while abortion rates overall have fallen a bit. It is expected that they have probably reached, or even overshot the equilibrium that they might have been seeking.