The Deseret Sunday School Union prepared this timeline for children in 1959. It is, I think, intended to help children memorize the names and order of the presidents and nothing more. You’ve no doubt seen similar lists of American presidents, or planets in the Solar system, or states in the union, where the factoids accompanying the name are meant only to help the kids distinguish one name from another, not to give any depth of understanding. With that perspective, I’ll bet it was effective. Kids have not only words but simple pictures to associate with the words, emphasizing stories or events — pioneers, scriptures, temples — they are already familiar with.
. . . . . . . . . If we were to update the timeline with more recent Church presidents, what one or two factoids or images would you suggest?