The US is facing wealth inequality right now almost on par with the gilded age, which resulted in serious social upheaval. Other than the gilded age, and especially for a long period in the last century, wealth equality has much better then than it is now. We could go back to that at least, for starters. But ever since Reaganomics we've been seeing more and more wealth accumulating to those who already have it. Democrats get elected and aren't able to make headway against it (or don't try very hard), but when Republicans get elected they make it worse (look at the Bush and Trump tax cuts).