Juan Rodríguez Cabrillo claimed the region for Spain in 1542. The Spanish established a tripartite colonial system: missions (religious/agricultural centers), presidios (military forts), and pueblos (civilian towns).
Missions aimed to convert Native Americans to Catholicism and integrate them into Spanish society. Indigenous people were often compelled to live at missions, leading to disruption of traditional lifeways, cultural conflict, and catastrophic population decline due to European diseases and harsh conditions.
Presidios protected missions and trade routes from Native resistance and foreign rivals (British, Russian). Pueblos like San José and Los Angeles became agricultural and ranching hubs, attracting settlers from Mexico and Spain.
Society was sharply stratified: Spanish elites (officials, officers, landowners) at the top; Native Americans and mestizos (mixed ancestry) at the bottom, often exploited for labor.
European and Native cultures collided, producing a unique Californian blend in language, architecture, cuisine, and crafts. However, Native resistance, droughts, and geopolitical tensions challenged Spanish control throughout the period.
The colonial era laid foundations for California's future: mission architecture, place names, agricultural patterns, and a complex multicultural heritage that persists today.