So the pressure has to be both on the Congress AND the President to improve ID's, then.
ID's are issued by states....Fed can push for more common ID's, but the states have to be willing to implement. Otherwise we have to push for a federal ID, which the Dems are against.
Regarding economic incentives, the Mexican work force is much more educated and competent and skilled than it was a generation ago, particularly as family size in Mexico drops like a stone, and parents are investing more in the children they do have. Therefore, the value added of these workers in the US has become higher, and thus the economic incentives to come on north have become higher. It isn't about illiterate rural Mexican peasants nearly as much anymore, who are not very effective workers off the strawberry picking fields.
It is something of a tragedy that the Mexcian economy is still so relatively dysfunctional, that the talents of this emerging skilled Mexican working class is not adequately rewarded.