As I have said before, there are plenty of really worrying developments in the theory and execution of power in the United States. When I say worrying, I mean worrying in the sense that they remind closely of things that totalitarian regimes have done in the past. We shouldn't be distracted too much by history when analyzing contemporary events - "History does not repeat itself, but it does rhyme."
The list, which you can compile by simply reading the news, is quite long: Warrantless dragnet surveillance, world record incarceration rate, selective enforcement and prosecution of unclear and conflicting criminal law, lifetime incarceration for non-violent crimes, utilization of paramilitary forces (SWAT teams) against non-violent offenders, plea bargains as a tool for simplifying prosecution under the threat of lifetime sentencing, indefinite detainment and incarceration with no judicial oversight (Guantanamo), extrajudicial execution of citizens (drone strikes), limitations on free speech during peaceful protests, systematic prosecution of whistleblowers.
These are just some issues which are interesting to discuss. I am an outsider, and I believe the things I have quoted are facts which have very small political bias in the interpretation. The United States' deadlocked political system and prosecutors' role in the execution of power is also worthy of discussion, although it is harder to discuss this without taking a particular political view.