The problem that exists today are people that enter the USA legally and overstay their visas. There is also the issue of illegals and the deaths of Americans. But, the idea there are streams of people coming across the US southern border is somewhat contained.
The money thrown into the effort has to have some impact.
By Jerry Markon
...As the Department of Homeland Security (click here) continues to pour money into border security, evidence is emerging that illegal immigration flows have fallen to their lowest level in at least two decades. The nation’s population of illegal immigrants, which more than tripled, to 12.2 million, between 1990 and 2007, has dropped by about 1 million, according to demographers at the Pew Research Center.
A key — but largely overlooked — sign of these ebbing flows is the changing makeup of the undocumented population. Until recent years, illegal immigrants tended to be young men streaming across the Southern border in pursuit of work. But demographic data show that the typical illegal immigrant now is much more likely someone who is 35 or older and has lived in the United States for a decade or more.
Homeland security officials in the Obama and George W. Bush administrations — who have more than doubled the Border Patrol’s size and spent billions on drones, sensors and other technology at the border — say enhanced security is driving the new trends.
“We have seen tremendous progress,” said R. Gil Kerlikowske, commissioner of U.S. Customs and Border Protection, which is part of the Department of Homeland Security. “The border is much more secure than in times past.”...
