Social histories of the twenties often account for opinions by referring to the response of groups to headline events. Many of these histories use familiar rubrics: the boom, the consumerism it induced, the moral and stylistic changes affecting different generations. The "Introduction to the Volume" of The Introduction concludes that Hemingway's letters and fiction are reliable evidence for the cost, nature, and value of things he observed.
Michael Reynolds wrote in The Young Hemingway (1986) that “not long after the movie of Roosevelt's African hunt played Oak Park, the Hemingway family-reunion picture shows young Ernest in his safari costume standing at the edge of the smilers. At his side he holds a hat like the one Teddy wore. In National Geographic, he devoured Roosevelt's account of the hunt, complete with pictures of dead animals and half-naked native women. Roosevelt's book African Game Trails became a permanent part of Hemingway's library.”