Some other people compare us to the Roman Republic, and maybe that fits better in some ways, but then there is less to "doom" about with that angle (and apparently Trump is Caesar in this one, and I have a hard time accepting that).
The Republic comparison feels more apt to me. Though I am less sure about the Trump = Caesar analogy. He feels far more like a Marius figure. I am partial to Mike Duncan's take, that the clearest analogy is the Roman Republican after the Punic Wars when the old Republican system began to break down.