Where did slap jacks come from?

Slap jacks, also known as "slapjack," is a traditional card game that likely originated in the United States during the 19th century. The game is believed to have evolved from various other card games, incorporating elements of speed and reflexes. It gained popularity among children and families, often played in informal settings. The name "slap jack" reflects the game's central action of slapping the pile of cards when a jack appears.