. Article XI offered a potential benefit to Mexico in that the US pledged to suppress the Comanche and Apache raids that had ravaged northern Mexico and pay restitutions to the victims of raids it could not prevent. However the Indian raids did not cease for several decades after the treaty although a cholera epidemic reduced the numbers of the Comanche in 1849. Robert Letcher U.S Minister to Mexico in 1850 was certain "that miserable 11th article" would lead to the financial ruin of the US if it could not be released from its obligations the US was released from all obligations of Article XI five years later by Article II of the Gadsden Purchase of 1853. !
. . .