The book includes a lot of details that feel very well researched. The narrative-style stories are supported by data--pounds of food served, tickets sold, money made, hours in flight, home runs hit by various people and teams, etc.--that got a little overwhelming in the audio version, but probably work better in the print version.
The two men that really anchor the book (and who had incredible summers) are Babe Ruth and Charles Lindbergh. I also learned a lot about Calvin Coolidge, Herbert Hoover, and Jack Dempsey as well as, to a lesser extent, Henry Ford, Sacco and Vanzetti, Al Capone, and many more.
In many ways, hearing the stories of 1927 put today's news stories in perspective. Things have been worse in America. Racism and antisemitism ran rampant. Prohibition was still the law of the land. Floods overwhelmed both sides of the Mississippi. Bombs regularly blew up public officials' homes, and the murder rates were higher than they are today. But most criminals went free because forensic science was not nearly as advanced. Journalists desperate to increase circulation printed whatever sensational story they thought would sell, regardless of the truth. Although most people didn't know it yet, the economy was about to crash devastatingly. In 1927, most people had grown up in an America that was constantly lagging behind Europe in innovation and cultural importance, even though America had most of the gold. And yet, the faceless throngs, which seemed to gather spontaneously around any notable event, feel optimistic.
If you know anyone who's been alive since 1927, think of all they've been through, of everything that has changed in the last 90 years.
And, next time the world feels like it's ending, look at how far we've come and how far we could still make it in the next 90 years.