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Casinos have been linked to organised crime, with early casinos in Las Vegas originally dominated by the American Mafia and in Macau by Triad syndicates. Many casinos use a loyalty rewards program used to track players’ spending habits and target their patrons more effectively, by sending mailings with free slot play and other promotions. Both of these specialized casino security departments work very closely with each other to ensure the safety of both guests and the casino’s assets, and have been quite successful in preventing crime. Given the large amounts of currency handled within a casino, both patrons and staff may be tempted to cheat and steal, in collusion or independently; casinos have security measures to prevent this. In Vietnam, the term «casinos» encompasses gambling activities within the country. Native American gaming has been responsible for a rise in the number of casinos outside of Las Vegas and Atlantic City.

According to Bloomberg, accumulated revenue of the biggest casino operator companies worldwide amounted to almost US$55 billion in 2011. However, in 1931, gambling was legalized throughout the state of Nevada, where the United States’s first legalized casinos were set up. During the 19th century, casino came to encompass other public buildings where pleasurable activities took place. The term casino is of Italian origin, from the root word casa meaning «house.» Originally, the term referred to a small country villa, summerhouse, or social club.