In 1909, thanks to Progressive opposition, the state criminalized gambling, though over the years a series of carve-outs allowed low-stakes social games - pastimes like poker, played against other players and not against a central bank. Here's the difference: In 1869, Nevada first legalized commercial gambling, which back then was primarily card and dice games played against the house. Rather, it brought back 'wide open' gambling. 98, which Governor Fred Balzar signed into law on this day, didn't 'legalize gambling' in Nevada. March 19, 1931: Commercial Gambling (Re) legalized The five dates discussed below are significant milestones that show how Las Vegas developed its dominance-and how it is hoping to retain it in the future. About 80 percent of that revenue comes from Las Vegas. Today, Nevada's gaming industry is a juggernaut the largest in the United States and second largest in the world, with annual casino revenues of more than $11 billion.