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The Spanish period began in California with the building of Mission San Diego de Alcala, and the Presidio of San Diego in 1769. The Spanish Presidio provided a support system for the attached missions that included military troops. The mission provided provided a complete community for the converted native peoples that included agriculture and industry activities as well as religious instruction and services. Typically a very limited military presence was maintained at the missions and the presidio acted as the garrison for the surrounding missions.