The American gambling industry won big on Election Day Tuesday. Three states voted to permit legal sports betting and three others either approved or expanded gambling in casinos. Casinos are businesses that have gambling and other forms of entertainment activities. Maryland, South Dakota and Louisiana approved betting on sporting events. The ballot results mean that, by the end of 2021, at least 25 states and the District of Columbia could have legal sports betting in place. The development comes less than three years after a U.S. Supreme Court ruling ended a federal ban on sports gambling in most states. “It appears that Americans are becoming increasingly comfortable with legalized gambling,” said David Schwartz. He is a gambling historian with the University of Nevada Las Vegas.