His most ambitious book was the four volume narrative The Winning of the West, focused on the American frontier in the 18th and early 19th centuries. Roosevelt said that the American character—indeed a new "American race" (ethnic group) had emerged from the heroic wilderness hunters and Indian fighters, acting on the frontier with little government help.[336] Roosevelt also published an account of his 1909–10 African expedition entitled African Game Trails.
In 1907, Roosevelt became embroiled in a widely publicized literary debate known as the nature fakers controversy. A few years earlier, naturalist John Burroughs had published an article entitled "Real and Sham Natural History" in the Atlantic Monthly, attacking popular writers of the day such as Ernest Thompson Seton, Charles G. D. Roberts, and William J. Long for their fantastical representations of wildlife. Roosevelt agreed with Burroughs's criticisms, and published several essays of his own denouncing the booming genre of "naturalistic" animal stories as "yellow journalism of the woods". It was the President himself who popularized the negative term "nature faker" to describe writers who depicted their animal characters with excessive anthropomorphism.