Among game publishers, Milton Bradley especially specialized in moralistic and educational games. It makes sense when one considers that it was very likely the parents or other adults who purchased such games for children. And educational games did not fall under the general gaming taboo that many Americans believed during the late-19th and early 20th centuries. The Game of Nations resembles the more popular game Authors, in which players collect matched sets of Authors' works marked on cards. Nations plays the same, with matched sets of countries under continents.