Final answer:
Stephen F. Austin initially supported Mexican rule but changed his attitude when he witnessed the oppressive actions of the Mexican government, leading him to become a strong advocate for independence during the Texas Revolution.
Step-by-step explanation:
Stephen F. Austin's attitude towards the fight for independence from Mexico initially changed because he initially supported Mexican rule. At first, Austin believed that the interests of the Anglo-American settlers in Texas could be best served by working within the Mexican system. However, his attitude changed when he witnessed the oppressive actions of the Mexican government, such as the dissolution of the Mexican Congress and the abolition of state governments. Austin then became a strong advocate for independence and played a key role in the Texas Revolution against Mexico.