Juan Jose Dominguez, a Spanish soldier, came to San Diego, California with the Gaspar de Portolà expedition, and later to San Juan Capistrano and San Gabriel, with Father Juniperro Serra. In 1784, Juan Jose was granted 75,000 acres of land from the Spanish Empire, signed by the Spanish King Carlos III, which was named Rancho San Pedro.

The original Spanish land grant included what today consists of the Pacific coast cities of Los Angeles harbor, San Pedro, the Palos Verdes peninsula, Torrance, Redondo Beach, Hermosa Beach, and Manhattan Beach, and east to the Los Angeles River including; the cities of Lomita, Gardena, Harbor City, Wilmington, Carson, and Compton.

In 1846, the Battle of Dominguez Rancho was fought on the rancho site during the Mexican-American war.

The rancho land grant was validated by the Mexican government @ 48,000 acres in 1828, and a US land grant validating 25,000 acres was issued in 1858 by the state of California.

• these facts were interpreted from the State of California museum's archives sections, State of California's Spanish / Mexican land grants and the Rancho Dominguez web site.

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