Charles C. Johnson has a great idea, here:
"[T]here’s a simple way to get them all to go home: Tax the money they
send back to the home country. One in nine Guatemalans are in the U.S.,
and they sent $4 billion back in 2010. Remittances are big money for
most of Central America. ... The illegals borrowing $5,000 in high-interest debt to
finance their smuggling on a $1,500 income
would think twice if we taxed their ill-gotten gains. Some might even
self-deport or, better yet, refuse to come in the first place. Indeed,
without the $20 billion a year Mexicans in America send home, Mexico would be even more messed up.
"Other countries already tax their foreigners. Why can’t we? We could
even use that taxed remittance money to pay off some of the costs we
incur from illegal aliens—and build that danged fence."