Because he wrote so harshly about human failings and weaknesses
The author thinks the setting can influence the story as much as characters can.
From the conditions of frontier life came intellectual traits of profound importance. The work of travelers along each frontier from colonial days onward describe certain common traits The result is that to the frontier the American intellect owes its striking characteristics. in the artistic but powerful to effect great ends; that restless, nervous energy; that dominant individualism, working for good and for evil, and withal that buoyancy and exuberance which comes with freedom
(Frederick Jackson Turner, “The Significance of the Frontier in American History,” The Frontier in American History (New York: Henry Holt and Company, 1920), 37.)
Answer:
1st choice and 3rd choice Hope I helped!
Had to look for the given sentence and here is my answer:
Based on the given sentence, the best revision for this would be the second one. This is the sentence that best shows an additional information that illuminates the reason of the writer. This sentence means that the given span of time would not suffice for the gathering of enough information. Hope this helps.
