A slight correction to something mentioned above by someone: The Chinese version is much simpler rules than the American version. The HKOS (Hong Kong Old Style) being especially easy of all the Chinese versions.
The Japanese version is also harder than the Chinese (the Chinese is the original version).
The American version is different as mentioned above, the yearly rules changes of special hands on the yearly card that must be purchased from the Association.
Also, American version has jokers (special Joker tiles) which are wild.
And the American version has the Charleston move (sounds like 1920’s dancing!).
Interesting to learn about the proximity of Chinatown to Jewish section of NYC being reason for popularity with that culture!
In 1922 the imports of the game started, and by 1925 the bottom fell out of the fad. The Pung Chow corporation that had just purchased 2 large factories a couple years earlier to make tiles went bankrupt. This crash in popularity meant middle America never got too much of a chance to even see the Mahjong. The imports from China landed in San Francisco and from there shipped to the biggest local stores in chain department stores like Macy’s and Gimbals. The largest stores were in NYC. So SF and NYC got the best shot at seeing Mahjong before the crash in popularity.
By the way it was a special circumstance that allowed Joseph Babcock to finally convince a corporation to put up money to begin importing the game tiles from Japan. This was because Babcock was vacationing in Santa Catalina Island off the city of Los Angeles.
In 1919 there was no radio stations to hear the news. And no telegraph on Catalina. Once a week a ship would arrive with newspapers. The post office delivered mail to Catalina by carrier pigeon!
Therefore the culture among all the retired people living on Catalina was to devour the local newspaper for any hints of the stock market, world news, and especially the society page to read about locals giving dinner parties. And especially any new locals arriving that might be giving and going to dinner parties: somebody new and interesting, anything or anybody ‘new’ was news, and they craved news because there was so very little news.
So the local Catalina newspaper society editors rushed to the newly arriving Babcock and wife, and Babcock got out the tiles to show off to them. Since every local read the paper cover to cover, everyone there saw the article and pictures of the tiles. And saw where Babcock had offered to mail back a set of tiles to anyone who paid in advance. Babcock was the head of the Shanghai dept. of Standard Oil which is why he was headed back to China.
So when he left Catalina to SF, he had hundreds of paid requests from individuals wanting tiles resulting from a single newspaper article. This convinced a local businessman that Mahjong might sweep into America and there was quick money to be made. The Mahjong Sales company of San Francisco was formed right there and Babcock was given large funds to buy all the tiles he could have made in China and mail them to SF warehouse where they were packaged in fancy boxes. This was 1922.
So the particular isolation of Catalina giving a greatly exaggerated response to Babcock’s newspaper article was the break that setup the fad to happen.
Vanity Fair had one type of article or another every month about Mahj for a year. Life had a picture of a couple playing Mahjong on the cover in 1924. For a couple years the game was King, and then it all collapsed the next year!