In 1854, the United States Government ratified a treaty with the Government of Mexico to purchase 29,640 square miles of Sonoran desert land for US$10 million.
As the Government of Mexico did not faithfully disclose a latent infestation of a substance that the EPA has called Universitatis Arizonum - an invasive blight on the southwestern ecological landscape - the United States Government should return the land in question and request a refund.
Adjusted for inflation, the amount requested in return comes to US$262,481,481.48, which can then be put towards a hedge of rose bushes along the redrawn border. Universitatis Arizonum has proven scientifically incapable of coexisting with roses, and this barrier should prove impenetrable.