San Diego's history is a tale of cultural diversity, maritime exploration, and military significance. First inhabited by the Kumeyaay people, San Diego became a Spanish outpost in 1769 with the establishment of the Presidio and Mission San Diego de Alcalá by Father Junípero Serra. Throughout the 19th century, it remained a small Mexican pueblo until it was annexed by the United States following the Mexican-American War in 1848. The city's strategic location along the Pacific coast made it a key port for maritime trade and naval operations. Its significance further increased during World War II when it became a major naval base. Post-war, San Diego experienced rapid growth and development, fueled by tourism, military presence, and the burgeoning aerospace industry. Today, it stands as a vibrant metropolis known for its beautiful beaches, thriving economy, and rich cultural heritage, blending its Spanish and Mexican roots with a modern American identity.