AskHistorians

US democracy drew heavy inspiration from British democracy. The main differences were that there wasn't a (largely depowered) monarch at the head, and that Americans actually got to participate in it.

It's important to remember that what caused the American Revolution wasn't the sudden urge for a new form of government - American colonies had been electing their own governments for over 100 years at that point. What caused the American Revolution was the sudden attempt by Britain to impose taxes on Americans without letting them participate in elections for the British parliament, which they were nominally legally entitled to do, as British subjects.

In the case of the USA specifically, at that time and place it was very much in vogue among the educated to be into all the trappings of classical Roman and Greek history. This is also why Greco-Roman style columns and other architectural fripperies were so popular both on plantation houses and government buildings. The founding fathers lifted no small part of their thoughts on democracy from the Greeks.

what happened here? [removed by mod]

Hundreds years of political philosophy, experience from similar processes happening in other countries, and pressure from other involved parties. They didn't exactly invent it.

Its a mash-up of European land ownership shit like the Magna Carta and stuff they lifted from the Haudenosaunee. They were just trying to codify a land owning oligarchy that already loosely organized their various cartels.

https://en.wikipedia.org/wiki/Haudenosaunee