At this time, gambling is still legal in this country. Then the government think that entertainment is used by organized crime and encourages corruption. In 1910, a law makes it illegal casino and gambling. This is the era of prohibition. Honest players stopped playing but the industry has not stopped. It continues illegally, and criminalizes more.

This is one reason why the state of Nevada authorizes new gambling in 1931. This decision allows the development of capital dedicated to the game. Casinos in these cities, we must propose new games.  Like Blackjack is not very well known, there is introduced.

At first, it does not meet the expected success, until the institutions decide to give bonus payments to attract players. One such bonus has a ratio of 10 against 1 if the player held an ace of spades and a black Jack. As it says blackjack English, was called the game as well. This variant does not exist anymore but the name was imposed at the expense of the old Twenty-one.

Successful methods to increase the earnings of players is dazzling. He worries that the casinos decide to change the rules to their advantage. Protests and boycott players push to return to the base game. They then introduce new techniques.

We can mention in particular apparatus for mixing the shoe rack and discard or use of multiple packs of cards. These techniques allow casinos retain an advantage in the bank high enough to continue to earn money.