Nothing. In the USA, and elsewhere, politics is doing what it's suppose to do which is to keep those with power, in power. The rest doesn't matter.
If you had asked: what's breaking this country? I would have then answered: politics.
One flaw in politics, as I see it, is its intrinsic hypocrisy. The great majority of politicians are politicians to serve their needs, whatever these might happen to be. But they'll never admit to this; they'll publicly swear that the only reason they are in politics is to serve their respective constituencies.
This is an ancient lie that's been repeated countless times but, somehow, the populace continues to believe it. Why this credulity exists on the part of the people might be related to their ignorance, learned piety [usually taught by the politicians co-conspirators, the clergy], etc.
Those very few ethical individuals, who also happen to be politicians, either conform with the status quo, remove themselves from politics, or they'll experience a fate similar to that of Pertinax.
Greed is very much a part of human nature and, by extension, of human enterprises. Unfortunately, there is no known immunization from greed's insatiable appetite with which to inoculate our beloved politicians.