Final answer:
Mendivil's predictions followed the Treaty of Guadalupe Hidalgo, which cost Mexico over half of its territory and led to systemic marginalization for Mexicans and Mexican-Americans in the ceded lands. While the feared complete territorial absorption didn't occur, the social and legal repercussions did resonate as predicted.
Step-by-step explanation:
The statement attributed to Mendivil reflects the consequences of the Treaty of Guadalupe Hidalgo, which concluded the Mexican-American War in 1848. The treaty confirmed the annexation of Texas and ceded vast territories including what would become California, Arizona, New Mexico, Utah, Nevada, and parts of several other states. This loss represented over half of Mexico's territory at the time. The vast land cession spurred by Manifest Destiny, along with the subsequent Gadsden Purchase, reshaped the map of North America and triggered profound legal and social challenges for Mexicans and Mexican-Americans residing in these annexed lands.
Racial tensions and discrimination followed the cession, with many tejanos and californios losing their land as the United States government declared Mexican and Spanish land deeds imperfect, setting a pattern of displacement and violence.
The unfortunate outcomes that Mendivil predicted did materialize to a substantial degree, as Mexicans and Mexican-Americans faced systemic dispossession and marginalization. However, the total absorption of Mexican territory did not continue indefinitely; Mexico retained its national existence contrary to the extreme outcomes Mendivil envisioned.