Anglo settlers were colonist in Mexico and Mexican settlers weren't
None. It was a clash between Mexican forces and Anglo-speaking settlers.
For some it was the prohibition against slavery and others opposed the mandate to be Catholics and to provide financial support to the Catholic Church.
Some of the conditions requested by Mexico to immigrate into Texas included to pledge allegiance to Mexico and observe the Mexican Law and customs. Most settlers not only didn't observe these laws, such as slavery banning, but also openly became defiant against Mexico's government. The Mexican government became aware that Anglo immigrants didn't integrate to the Texian society -- they built their own towns, away from Mexican settlements -- and their proportion was becoming ten Anglos per one Mexican. Hence, they limited the number of immigrants.
Stephen F. Austin was arrested in 1833 by Mexican authorities for allegedly encouraging insurrection and attempting to incite rebellion against the Mexican government. Austin had been advocating for greater autonomy for Texas and was seen as a threat to the central Mexican government's control over the region. His arrest was part of a larger crackdown on dissent in Texas as tensions between the Mexican government and Anglo-American settlers escalated.
Anglo settlers were colonist in Mexico and Mexican settlers weren't
Because the Texas Revolution not simply an Anglo revolution against the Mexican government, it was a Texian and Texican War of Independence against Mexico.
Mexico had been promoting immigration to that region to the point where there was a huge influx of American citizens interested in the cheap land (as if they didn't have enough). This worried the Mexican government, who decided to restrict immigration and take away some of the land granted to the american settlers. This pissed them off royally, and they rebelled.
Anglo settlers to Texas weren't the only Mexican citizens upset in 1835. Quite a few areas of Mexico were in open revolt. Santa Ana had abrogated the 1821 Mexican Consstitution. This is why you will see Mexican flags with an 1821 on them, it was the bearers way of saying that the government should uphold the Constitution. They were upset, because Santa Anna and the Mexican government had locked Stephen F. Austin up.
None. It was a clash between Mexican forces and Anglo-speaking settlers.
That Anglo settlers would try to revolt and secede from Mexico.
After a small revolt Mexico became worried that America was trying to take Texas. The Mexican government sent General Manuel de Mier y Teran to investigate Texas. He observed that: the Anglo (white) American settlers outnumbered the Mexican settlers five to 1 (for every 5 Americans, there was only 1 Mexican)
The Texas Revolution (1835-1836), when Anglo settlers who helped colonize Texas on behalf of the Mexican government split up to conform the Republic of Texas. See related questions for further detail.
It was a siege, where Anglo-American settlers entrenched themselves within the El Alamo chapel. Mexican troops laid siege and ultimately defeated such settlers.
For some it was the prohibition against slavery and others opposed the mandate to be Catholics and to provide financial support to the Catholic Church.
The Texas Revolution (1835-1836), when Anglo settlers who helped colonize Texas on behalf of the Mexican government split up to conform the Republic of Texas. See related questions for further detail.
Constant harassment by Anglo settlers to sell or leave their lands, as the US government didn't recognize the Guadalupe-Hidalgo Treaty in terms of the possessions held by newly integrated citizens. It was the norm to be driven off or lynched; only those who married other Anglo settlers were able to keep their possessions.