Final answer:
The Mexican government was angered by Texans due to cultural differences, economic threats, and legal non-compliance, particularly regarding the issue of slavery and the desire for Texas to be annexed by the U.S. Mexican efforts to curtail these issues through legislation and military reinforcement only led to increased tensions and conflict.
Step-by-step explanation:
The Mexican government had several reasons to be angry with the Texans during the period leading up to the Texas Revolution and the Mexican-American War. Culturally and economically, Texans maintained distinct practices that conflicted with Mexican law and societal expectations.
This included the refusal to integrate fully with Mexican culture and the flouting of laws concerning language, religion, and most notably, slavery. The government's abolition of slavery through President Vicente Guerrero's proclamation directed at weakening the Texan influence only exacerbated tensions. Texans, many of whom were from the southern United States, not only desired to maintain slavery but also sought annexation to the U.S., which betrayed a loyalty to the United States over Mexico.
Relations further deteriorated as the Texans, and American expansionists, systematically ignored Mexican laws, culminating in revolutionary actions and declarations such as the Fredonian Rebellion and increased pressure on joining the United States.
The Mexican government's various efforts to curb the growing discontent among American settlers in Texas, including banning further U.S. immigration and strengthening military presence in Texas, failed, instead, fueling defiance among the settlers, who largely viewed themselves as superior to the Mexican officials and society.