Okay, so this notion is still a bit undefined in my head, kind of figuring it out now, as I type.
I want to come up with a list (doesn't actually have to be 10) of the worst things the US government has done, to undermine the ideals and principles that the United States was (at least nominally) founded on ... truth, justice, baseball and mom's apple pie - kinda stuff.
You can go back as far in history as you like (so Civil War, Dred Scott, things like that are absolutely open for consideration) ... but it has to be something that continues to significantly impact US govt, US society and/or the world, to this day ... something they have not remedied.
Off the top of my head, the main thing that comes to mind is the Citizens United case, which I believe has fundamentally broken the US political system (which was, previously, already seriously frayed). I'd also consider the non-consideration (by the Senate) of Merrick Garland's Supreme Court nomination (by Obama), and the US (both the govt and the public) collective "whatever" to the news that Russia interfered in the 2016 US elections (and continues to do so, now joined by China and assorted others).
I may edit this to refine the idea. But the basic goal is to create a really high-level list of "First Things" the US needs to fix, to have any hope of returning to a state of democracy (okay, democratic republic), and/or normalcy.