The 21 oclock predecessor was "vingt-et-un" (meaning in French 21) that originated in the French casinos around 1700.
First Blackjack Blackjack Why? At first 21 was not popular in the United States, so the casino tried various extra bonuses to attract gamblers to participate. One of the extra bonuses is that when the player has both Spades A and Black J (Spades J or Plum J) in the players hand, the prize money will be tenfold. This card is called "black jack" (black jack, blackjack)
What are you waiting for, quickly open BlackJack journey!