The Robber Barons weren't in the 1920s; that refers to industrial age monopolists (e.g. rail/oil), and culminated in the Sherman Antitrust (i.e. 1800s).
Broadly, your point is still valid, though. Just a mild inaccuracy between the Gilded Age and the roaring 20s.
Broadly, your point is still valid, though. Just a mild inaccuracy between the Gilded Age and the roaring 20s.