• Arizona;
  • Mexico;
  • historical ties;
  • undocumented migration;
  • redistributor;
  • region

This study examines geographic patterns of undocumented Mexican migration to Arizona, utilizing Immigration and Naturalization Service records of deportable Mexican aliens. The analysis uses a comparison with known patterns for other destination states, as well as with historical information on Mexican migration to Arizona. The results reveal the importance of Arizona's unique historical connections with Mexico in formulating networks, which build on regional ties with Sonora and the greater Mexican northwest. Results also support the emergence of new migration systems, particularly the link with internal migration within Mexico through redistributor cities and migrant origins from outside of traditional sending areas.