[lisasays]

The problem seems to be driven by undocumented workers crossing the border.

No, as always (and from basic physic, as it were): what it's driven by is greed, and a lack of oversight. And to some extent, it may be a negative side effect of the rising minimum wage in some states. The undocumented workers, are just following the path of least resistance -- and are getting sucked in over the border, in response to these forces.

Remember, by themselves they are essentially powerless -- and the very opposite of a "driving force" for anything in this picture,

[lisasays]

"basic physics"