This section is about American sets that were marketed under the same brand name. In manifold variations in quality and price. ‘A Mah Jongg set for every purse’.
Obviously a marketing tool, an answer to the appeal of those attractive Chinese boxes.
Via eBay I gathered sets made by six different brands. Two of them, Parker Brothers and Milton Bradley, are still making games.
The other section, US general, contains sets that are mainly one of its kind.