Which act combined individual Mexican states of Coahuila and Texas?

The Mexican Federal Act of May 7, 1824, is the correct answer because it established the framework for the federal republic in Mexico and integrated the individual states, including Coahuila and Texas, into a single entity. This act not only redefined the boundaries and governance of these regions but also symbolized the shift from a centralized government under Spanish rule to a more localized form of governance as encouraged by federalism.

Under this act, the combination of Coahuila and Texas into one state aimed to facilitate better administration and representation for the growing population in these areas. The new state of Coahuila and Texas had its own legislature and governance structure while remaining part of the larger Mexican federation. This development was crucial in the context of Texas' eventual struggle for independence, as it helped to establish distinct political identities that would later seek to assert greater autonomy.