This article is talking about the (arguably less known?) 4-player competitive game [2], and assumes you already know the difference (which some may not).
https://bamgoodtime.com/blog/history-of-american-mahjong
> What followed was one of the biggest game fads in American history. Between roughly 1922 and 1924, mahjong exploded across the United States. Department stores couldn't keep sets in stock. Demand grew so quickly that bone and bamboo tiles had to be imported from China in enormous quantities. Newspapers ran columns explaining the rules. Eddie Cantor performed a hit song called "Since Ma Is Playing Mah Jong." Fashion designers created mahjong-themed clothing. Entire social calendars reorganized around the game.
Reminds me of poker.
Also I miss the excitement of a new issue of a magazine with a demo disc of a few new games.
I only learned it was also multiplayer when it appeared in some movies.