The history of human activity on Santa Catalina Island, California begins with the American Indians who had inhabited the island since 7000 BC. The first Europeans colonists to arrive on Catalina claimed it for the Spanish Empire. Over the years, territorial claims to the island transferred to Mexico and then to the United States. During this time, the island was sporadically used for smuggling, otter hunting, and gold-digging. Catalina was successfully developed into a tourist destination by chewing gum magnate William Wrigley, Jr. beginning in the 1920s, with most of the activity centered around the only incorporated city of Avalon, California. Since the 1970s, most of the island has been administered by the Catalina Island Conservancy.