> It seems like the US has become what the USSR was
As somebody who actually lived in the USSR I call bullshit on this. There's a huge difference between arresting people for saying something the powers don't like and restricting business links to certain aggressive dictatorial regimes. True, many citizens of those regimes suffer twice - once because they live under a dictatorial regime and second time because of the effect of economic sanctions. And it is true that economic sanctions disrupt free flow of information and trade. They are a kind of warfare but one where people don't get killed - which is not good, all warfare is bad, but better than the other kind.
It is bad when there is a war between two countries. It is worse when the government wages war on its people, and that what happened in the USSR. It is nothing like what is happening in the US. Nowhere in the US you can be arrested or imprisoned for saying anything - including praising USSR, Russia, Putin, ayatollas, Hezbollah, whatever you like.
> The US doesn't yet have massive prison camp systems full of political dissidents
"Yet" is extremely disingenuous here - there's absolutely no indication US is anywhere close to have it, on the contrary, US has the strongest free speech laws among all developed countries, and the high courts consistently reject any attempt to change that. In fact, what I am hearing every day is how there's too much free speech and how it should be suppressed and restricted for my own good, lest I read something wrong and get offended.
> but then, for the first couple of decades, neither did the USSR.
Technically might be true, if you say reduce first couple of decades to first decade - Gulag started in 1929. But not because the bolsheviks were kind of heart - before, they just murdered whoever they considered the enemy of the people (or, in rare cases, kicked them out of the country). After Stalin came to power, he realized there's a lot of work to be done and he can't use the capitalist way of paying people for the work, and if he just keeps killing everybody there would be nobody left to do his grand projects. So he used the other way - put people in prison and force to work (of course, he still killed plenty but some were spared for prison camps). Even Soviet space program and nuclear program was done by people who were effectively prisoners (word to look for is "sharashka").