A graduate of Groton, Frederick Lewis Allen graduated from Harvard in 1912 and earned his master's from there in 1913. Allen was assistant and associate editor of Harper's Magazine for eighteen years, then the magazine's sixth editor in chief from 1941 until shortly before his death. He was also known for a series of contemporary histories that were published during a period of growing interest in the subject among the reading public.
Yeah, it’s best points are what the USA looked like in late 19th century and then why it started to change and some of the forces changing it over the early 20th century.