Final answer:
Texans declared independence in 1836 due to political disenfranchisement after Santa Anna's centralization of power, economic restrictions, and social tensions, leading to the establishment of the Lone Star Republic, which permitted slavery and aligned with U.S. expansionist interests.
Step-by-step explanation:
Texans decided to declare independence in 1836 due to a combination of political, economic, and social factors. After General Antonio Lopez de Santa Anna dismissed the Mexican Congress and abolished state governments, including Coahuila and Texas, a sense of political disenfranchisement grew among the settlers. The imposition of customs duties, suppression of land titles, and restriction of commerce led to increasing tensions. Events such as the Anahuac disturbances and the battle of Gonzales amplified the discontent, culminating in the Consultation of 1835, where Texans expressed their desire for a return to constitutional governance. The final straw came when the delegates met in March 1836, declaring independence and establishing a constitution that allowed for slavery, an American-style judicial system, and an elected president and legislature. The Lone Star Republic was born out of aspirations for liberal reforms, economic benefits, and ultimately the goal to join the United States, aligning with the expansionist dreams of many American settlers in Texas.