Earlier quoted context omitted.
Sure, but the 19th century ended over 120 years ago. So that's kind of not relevant to how they're structured and operate today?
Not relevant? Do you somehow imagine that how things were done in the past doesn't affect "how they're structured and operate today"?
The late 19th century has so much "nothing to do" with today that it's literally irrelevant other than being a good window into how different things were, and as historical setup to then transition into "and then everything changed as a result of the great depression, with the US further burdened in the years following until the repeal of prohibition" which forced literally every government agency to change the way it worked.