Enforcement, even the promise of enforcement WORKS. Just ask the far left illegal alien/open borders lobby and the illegals themselves.

Below a short excerpt from that (not) far-right Creative Loafing paper.

As July 1 approaches, many immigrants – both illegal and legal – are
scrambling to decide what to do. Some individuals have obtained black-market
documents, while others have packed up, ready to move to a different state.
It’s a substantial change from the vocal, historical immigration protests
and boycotts that made national headlines last year.

“The immigrant community is very fearful and anxious,” says Jerry Gonzalez, executive director of the Georgia Association of Latino Elected Officials.
“People are selling their homes, liquidating their assets and emptying their
bank accounts to ensure that they will be able to move on a moment’s
notice.”

While immigrants such as Sanchez weigh their options, metro Atlanta
businesses may also have to scramble to deal with some unexpected
consequences of the law. Gonzalez says the Home Builders Association of
Georgia expects the time for homes to be built to double and the costs of
new homes to increase by 10 to 30 percent, because American workers will
demand higher pay and only work 40-hour weeks.