That US democracy is broken has been apparent since sometime around 1980. I have said so frequently. There have even been studies. I must admit though, I didn't realise in 1980 as I was seven.
I think you're missing my point, however, which is that the question should not be 'what did the democratic party do wrong' but rather, how do you amend the system so it works for everyone.' Currenlty it doesnt.
And, my usual caveat, we're ◊◊◊◊◊◊ over here too. Just not quite so far down the path. I believe Musk has plans to accelerate the process, however.