I think we all agree that the history written on the monument to be accurate. There are Mexican radical extremist who would (wrongfully) disagree.
According to these Mexican extremists, Texas is still a territory of Mexico illegally gained by the USA. A significant number of Mexican citizens living illegally in the US and naturalized US citizens from Mexico have the opinion that the annexation of Texas into the USA was an invasion of Mexico. While googling on Texas history, I found PBS documentary website interviewing Jesús Velasco-Márquez from the Instituto Tecnológico Autónomo de México who argues that Mexican government documents written in 1836 to 1845 show that they considered the secession of Texas illegitimate, and reaffirmed Mexico’s right to reincorporate their territory of Texas by any means necessary, including the use of force (thus Mexico's reason for war). This PBS interview continues... Mexico considers, that despite Texan being recognized by other countries back then as an independent nation, the conflict was an internal Mexican government problem very similar to the conflict faced by the U.S. government concerning the succession of its southern states in years later. Mexico considers the annexation of Texas to the United States as a violation of the 1828 border treaty --- a treaty where USA acknowledges Mexico's sovereignty over Texas, New Mexico, Nevada, and California.
I found it interesting and most disturbing that when asking many of my friends of Mexican heritage (2nd and 3rd generation in the USA) about their opinion on the immigration bill, they told me their alliance is to Mexico first (to support family and friends), then USA second. I guess grade schools in Mexico teach their children this story where it is faithfully believed as an adult and taught to their children above all evidence presented to the contrary.
The "Aztlan" and "Mexica Movement" are two of such radical extremist groups that have plans to relocate as many Mexicans into the Southern States of the US as possible, legally and illegally, supposedly so that the Mexicans become the majority race in the Southern States to have numbers (to try) to force succession from the USA to give the land back to Mexico.
Found via google:
http://la.indymedia.org/news/2006/03/151648
http://www.myspace.com/aztlanunderground
http://www.mexica-movement.org/granmarcha.htm
http://aztlan.net/