But back to the main question. & it may well be argued that, in the context of poetry, this is not the "main question" in any sense. You will have to prove it, Pushkin (Pushkin the black cat is sprawled on the bed in the other room. He's had a long day.) What does the US experiment in democracy have to do, directly, with the progress of poetry in english?
But it has been argued that the US experiment in democracy is not so much nationalistic in essence as civilizational. It was a project in government based on Thucydides & Locke & the Enlightenment, to a large extent. I'm talking not about the economic underpinnings, but the superstructure, if you will; about the philosophies of governance which inspired the planners.
The founders plunked for a republic, something between direct democracy and elite governance. In other words, a utopia. Atlantis.
Impossible. Analogous to the way that family happiness is impossible : yet it happens. Silly Brit monarchy; silly Yank democracy.
Silly Feds in rancher-land; silly park rangers.
Silly Man! [huh?]