They decided to re-legalize casino gambling in 1931 . Thus began a gradual trend toward re-acceptance of different forms of legalized gambling back into American society . Throughout the 1930s , 21 states brought back racetracks . Low-stakes charity bingo began to spread throughout the nation . By the 1940s and 1950s , almost all states had changed their laws to allow pari-mutuel wagering and low-stakes charitable gaming . In contemporary times , the gaming business is expanding in leaps and bounds , and many state governments are sponsoring...











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