The problem isn't the 57,000 or so illegal immigrant children who have crossed the border recently, or the 12 million illegal immigrants who are already here.The problem is the billion or two behind them who are thinking about heading this way. Once that billion or two come to believe that we'll let them stay they'll be on their way.When that happens, America will cease to be the place where Americans live. Instead, we'll have no say in who sets up shop here. The U.S. as a meaningful entity will cease to exist.Our history, traditions, and customs will be swamped in a sea of foreigners who used our own laws and charitable impulses to play us for suckers.Bill Earle, Parkville-To respond to this letter, send an email to firstname.lastname@example.org. Please include your name and contact information.