Keno is one of the oldest games in the casinos.
Keno was invented some 3000 years ago by Cheung Leung, a ruler of the great Han Dynasty. 
The game he invented was somewhat similar to the modern keno we play today. This same game is still played today in china, only the number of characters used from the “thousand character classic” has been reduced to80.
While keno in its purest form did not leave China until the beginning of the twentieth century.
However, the history of keno picks up the pace in the beginning of the twentieth century.
Gambling was authorized in Nevada in 1931, lotteries were not legalized. And keno was seen as a lottery by the Federal Government. Keno operators simply changed the name to racehorse keno, effectively masking the real aim of the game.
In this day, in many casinos, each separate draw is called a “race.” When the government passed a law that taxed off-track betting, thus legalizing keno, the name was changed once again, to keno.
