The US is a plutocracy. It's in no sense a working democracy. There's a public voting circus every couple of years, but policy - which is the only thing that really matters in politics - is largely defined by Wall St, the Fed, and by mil-ind corporate lobbying groups.
All of the above are politically unaccountable and legally untouchable. See for example the ridiculous excuses made to prevent the passage of:
https://en.wikipedia.org/wiki/Federal_Reserve_Transparency_A...