Ranchos of San Diego County: Historical Photos & Stories | California Local History Book | Perfect for History Buffs & California Travelers" （注：原中文标题"Ranchos of San Diego County (Images of America)"已全部为英文，故无需翻译。优化后增加了描述性关键词和用户场景，符合SEO规范）

The Mexican ranchos of San Diego County were a colorful and vital part of early California history. Ranchos covered the most fertile lands in San Diego and produced grain, vegetables, and fruits and grazed thousands of head of cattle, sheep, and horses. The dons and doñas who owned the ranchos were wealthy in land and cattle and built large adobe ranch-house complexes. The Kumeyaay, Luiseño, and Cupeño were the backbone of the ranchos, providing the labor needed to run a successful ranch. Daily life of the dons, doñas, and their families included the Californio traditions of family and religion, dancing and fiestas, roundups and rodeos, and generous hospitality. Many of the ranchos no longer exist. Those that are preserved provide a window into California's past.