Why Mexicans still implying that there are no borders and illegally obtained their land and want him back?

Demonstrators gathered Saturday at Chicano Park to bring attention to their cause of comprehensive immigration reform. A handful of the protesters told local TV station Channel 10 (Www.kgtv.com) who do not believe there should be a border between Mexico and the United States. One member of the group Movimiento Estudiantil Chicano de Aztlan (MECHA), a student organization, told the local ABC affiliate that the southwestern states of California, Nevada, Arizona, New Mexico and Texas were seized illegally from Mexico in the war which lasted from 1846 to 1848, and that the five states must return as part of Mexico. The land became part of the United States after the Treaty of Guadalupe Hidalgo. Meanwhile, members of MEChA wants to see an end to immigration raids and customs officials and border to be "demilitarized." http://www.examiner.com/x-833-San-Diego-News-Examiner ~ Y2009m4d12-Mecha-needs-to-get-one-track-of-problems-with-us-and-Mexico

The fictional story is silly. Almost no one understands that while the Southwest was his more primiative, very, very few people lived there because it was drying, and getting dryer every year. wet cycle drought took seven years, and simply do not live well under the circumstances. Pope stole it from the Indians and gave it to the Spanish. The Mexican elite tried to rob the Spanish, but really did not want or try to take care of him, and finally, the Mexican peasant tried to take the land. But in the end, they came to collect taxes in the period 1780 and turned around and left when they realized there was no gold or silver so far, and no water. Only wheat and corn patches. He never good. All fighting in the 1846-1847 period actually happened in Mexico, where there was water. It's really, really foolish to suggest that stole it from the Mexican nation.

FOX 6 Coverage of San Diego Vigil, 10.17.07