Its likely blackjack was born after paper was invented around the 10th Century in China or Korea. Around the 14th Century, playing cards slowly-slowly spread across Europe, modifications being made as they passed through each country. Most likely “vingt-et-un” (French for 21) was inspired from earlier games and originated in French casinos in the early 1700s.
Blackjack came to the United States in the mid 1860s when gambling was legal in the western United States. In 1910, Nevada outlawed casinos, but had a change of heart in ‘31 and compulsory regulations to protect players. Over the years blackjack has spread throughout the world and is almost certainly the No. 1 casino game on the Internet.