Indigenous Americans raided the settlers because they sought to reclaim their traditional lands and resources. The effect of these raids was that Texas became a contested region, leading to increased tensions and conflicts between Indigenous peoples and settlers. This resulted in Texas becoming a battleground for power and control, ultimately shaping its future development.
In my opinion, I think that the Spanish missions were the most difficult for the Indigenous people because they often stripped them of their autonomy, culture, and traditional ways of life, forcing them into a new community structure that prioritized Spanish interests over their own.
Mexican leaders allowed Anglo-American settlers to bring enslaved people with them because they believed that the addition of labor would help to stimulate economic growth and development in the newly acquired territory of Texas.
The Anglo-American settlement of Texas differed politically from previous governance in that it operated under a system of self-rule and local autonomy, often disregarding Mexican laws, while economically, it shifted toward a reliance on agriculture and slave labor, contrasting with the more diverse economies of existing settlements.