The premise contains a historical inversion. Apache groups (Chiricahua, Mescalero, Jicarilla, Lipan, etc.) already inhabited the present-day U.S. Southwest and northern Mexico when Spanish colonists arrived in the 1500s. They did not "flee to Mexico"—they defended ancestral territory spanning both sides of the later international border.
Apache raids were strategic: targeting livestock (wealth mobility), captives (integration/adoption), and supplies. They utilized superior mobility, desert knowledge, and decentralized leadership. Spanish "guerra a fuego y sangre" (war by fire and blood) policies escalated violence cyclically.
Independent Mexico continued Spanish policies but with fewer resources. Scalp bounty laws (1830s) incentivized killing. Some Apache bands made temporary peace treaties; others intensified raids into Chihuahua, Sonora, Durango.
Post-1848, Apache resistance continued against American expansion (Gadsden Purchase 1854, forts, reservation confinement). Geronimo's surrender (1886) ended armed resistance; Chiricahuas imprisoned in Florida/Alabama/Oklahoma.
Apache agency, territorial knowledge, and adaptive resistance—not flight—defined their engagement with colonial powers.