In the 20th century, Oceanside was a beach town devoted to activities on a stretch of beaches. Residential areas like downtown (built in the 1890s), South Oceanside (built in the 1920s and 1930s), and developments east of Interstate 5 (built after World War II) are preserved and remodeled when these houses are considered to have historical value. Since the establishment of Marine Corps Base Camp Pendleton in 1942, Oceanside has been home to U.S. armed forces personnel, and the wartime industry of WWII and the 1950s had an ammunition manufacturing facility in the city.