The document summarizes the Marqués de Rubí report from 1754-1785 regarding changes in Spanish Texas. It notes that France lost land after wars with Britain and Spain gained the Louisiana territory. De Rubí inspected the northern borderlands in 1766 and found the presidios threatened. He recommended abandoning settlements east of a new frontier line and consolidating the Spanish population in San Antonio for stronger defense. This led to East Texas' withdrawal beginning in 1773 and the relocation of Tejanos westward, eventually founding Nacogdoches in an effort to befriend local tribes.