The fence which divides Mexico and the U.S. is seen along the common border near the Mexican border town of Tijuana March 2, 2006. The income gap between the U.S. and Mexico is the principal reason why hundreds of thousands of Mexicans cross the border with the U.S. illegally to seek work -- yet it rarely figures in the heated and increasingly emotional debate over immigration now raging in the United States. (Jorge Duenes/Reuters)
Income gap.
And how much of that $200 billion would actually be used for the claimed purpose after Mexico's elites took their cut?
I'd guess around $100.
(v) Border access improvements that enhance goods movement between California and Mexico and that maximize the state's ability to access coordinated border infrastructure funds made available to the state by federal law. (snip) (b) Grants for wastewater treatment for economically disadvantaged small communities, including, but not limited to, communities near the California-Mexico border. (snip) (e) Containment, cleanup, and remediation projects to prevent public exposure to contamination in rivers along the California-Mexico border and for related capital improvements.