with over 400 passengers trying to get to the gold rush territory. She left New York City October 6, 1848, before the gold discoveries were verified and the gold rush truly stated. Shipment of passengers and freight to Sacramento was accomplished by off-loading the cargoes and passengers onto paddle steamers for transit up the Sacramento River to Sacramento, Stockton, etc. As the population spread out and grew ports were established up and down the California coast with other major ports in Long Beach, Los Angeles and San Diego. The largest U.S. Naval base on the west coast is now in San Diego. (See: Maritime history of California for more information.) The state's shipping industry evolved to handle cargoes to and from California to Europe and the eastern United States and help support the growing international trade with South America, Asia and Oceania. During World War II, numerous military bases and various wartime industries were quickly established in the state to support the Pacific Ocean and Atlantic ocean fleets—ships could use the Panama Canal to get from ocean to ocean. California led in the number of merchant ships built at the Kaiser shipyards in Richmond and the Los Angeles areas. Mare Island Naval Shipyard (now closed) in the San Francisco Bay built submarines as well as repaired many of the ships used by the U.S. Navy Pacific Fleet in World War II. The rapidly growing California aircraft industries was greatly expanded. Since then these defense connected industries have largely closed down or moved to cheaper areas in the U.S. With Thomas Edison's invention of the Kinetoscope (early movie camera) in 1894, California would become a leader when "talkies" were introduced in the sound film movie industry. The idea of combining motion pictures with recorded sound is nearly as old as film itself, but because of the technical challenges involved, synchronized dialogue was only made practical in the late 1920s with the perfection of the Audion amplifier tube and the introduction of the Vitaphone system. After the release of The Jazz Singer in 1927, "talkies" became more and more commonplace. Within a decade, popular widespread production of silent films had ceased. Cheap land, good year-round climate and large natural spaces prompted the growing film industry to begin migrating to Southern California in the early part of the 20th century. The film patent wars of the early 20th century actually led to the