That would depend greatly on which They you have reference to.
They could refer to a Coloradoan who has a family that settled in Colorada in 1800.
They could refer to a seventh generation resident of Santa Fe.
They could refer to the families of men who died fighting at the Alamo.
They needs a reference point, who are They.
Sleepy
Nothing, as it is a Mexican / Mexican-American celebration. If ever, French feel uncomfortable. See related questions.
Because there heritage is Mexican even if citizenship has changed.
The Mexican cession was the outcome of the Mexican American war.
1846-1848 For more info, Google it.
Mexican-American
The Mexican-American War was not unnecessary.
Selena Quintanilla was an American singer. Her parents are of Mexican-American descent..
The Mexican Cession.
0%. You are either Mexican, or American.
Taboo from Black Eyed Peas is Mexican and Native American.
It just raised hatred against Americans. The many interventions against Mexico by American troops damaged the Mexican-American relations for decades, at least until president Roosevelt visit to Mexico in 1943.