The price tag, until now, has not been public. But AP, using White House budgets, reports obtained through Freedom of Information Act requests and congressional transcripts, tallied it all up: $90 billion in 10 years.
For taxpayers footing this bill, the returns have been mixed: fewer illegal immigrants but little impact on the terrorism issue, and certainly no stoppage of the drug supply.
The Sept. 11, 2001, terrorists didn't come from Mexico, but the attacks led politicians to re-examine border security. Ten days later, President George W. Bush announced a new Department of Homeland Security, with tasks including the security of the nation's porous southern border.
Over the next 10 years, annual border spending tripled as the U.S. built an unprecedented network along the 1,900-mile border with Mexico..."