Can A Border Fence Curb Illegal Immigration?

"It's time to build a real fence or a wall along every foot of the 1,989 miles of the U.S.-Mexican border...I do not like advocating a fence. It looks and feels bad. It's easily stigmatized as racist. It would antagonize Mexico. The imagery is appalling, but it beats the alternative: a growing underclass and social tensions. Moreover, a genuine fence would probably work. The construction of about 10 miles of steel and concrete barriers up to 15 feet high in San Diego has reduced illegal crossings in that sector...Sure, there will be tunnels and ladders. But getting in will be harder. Policing will be easier. We also need to stiffen employer fines for hiring illegal aliens...There's a paradox. To make immigration succeed, we need to curb some immigration. That's why it's vital to control our border."