"As We Go Marching" is a three-part examination of fascism in Italy (part 1) and Germany (part 2). Part 3 ties things together with an examination of Franklin D. Roosevelt's so-called "New Deal."
The book covers periods from the mid-1800's, the time of the respective unification of Italy and Germany, to mid-WWII. Briefly, neither Mussolini nor Hitler laid the foundations, let alone invented, the social-government systems that supported their regimes. Both systems of fascism, Italian and German, had roots in the early days of industrialization, with deep and powerful roots in the concept of syndicalism. Mr. Flynn opines that, absent certain events related to The Great War, neither Mussolini nor Hitler would ever have amounted to much more than minor political nuisances; but that someone else could very well have held power and governed via fascism through pre-existing government institutions. (eg, imagine a German Chancellor without the anti-semitism but still with the militarism.)
The third part of "Marching" concerns the intellectual and systemic relationships between Italian and German fascism and FDR's New Deals (there were at least three of them). Although the reader will learn a lot of Italian and German history, the entire book concerns what FDR was doing to the United States in the 1930s. Mr. Flynn's view is through a lens of what had happened in Italy and Germany.
In 1944, some critics called Mr. Flynn's publication of "Marching" treasonous. But I doubt they read the book before doing so. Mr. Flynn was labeled, in his day, as a "Roosevelt-hater" and summarily dismissed in polite company of the time. Many people worked overtime to discredit him and his books. But to this modern reader, Mr. Flynn offers a historical and logical, well written and consistent study of fascism, with a disturbingly accurate critique of FDR and his programs.