The Epic of Gilgamesh is one of the oldiest stories that has been written in the history of mankind; oldest preserved stories at least. It was written on clay tablets which are to some extent still preserved today. And this is a feat which has immeasurable value considering what we can learn from it.
The correct answer to this open question is the following,
In 1829, President Andrew Jackson offered to buy Texas from Mexico for $5 million. The Mexican government responded to President Jackson's offer to buy Texas with a negative. Mexican rulers did not agree.
The reaction of the Mexican government was to prohibit more American emigration to Texas. United States people and some Texans did not want to learn and assimilate the Mexican culture, did not want to convert into Catholicism, and never considered learning Spanish, the official language in México.
Texans did not consider themselves Americans, either Mexicans; they were Texans and were eager to form their own Republic.