A US state is not a country. I get that there is a lot of federalism in the US and that states often have different laws and regulations, but the same is true for European countries. You can compare the US to Germany, or Sourh Carolina to Bavaria, by your own logic.
You can compare all of the US to just a suburb of Paris, if you insist on making stupid comparisons, but lumping all member states into one monolith is pointless both ways. Oregon is incredibly different from Florida, and so is France from Romania
Sure. But Occitaine is also incredibly different to Normandie, so it'd be a fairer comparison.
Romania and France are different in a way that Oregon and Florida aren't. They have the same federal government, the same official language and relatively similar culture. Yeah, there are differences, and they can feel huge if you're in the western bubble, but differences like those are also found in other countries.
I will concede that the US is more ethnically or racially diverse than most parts of Europe, but that's about it. Saying that Oregon and Florida are as different to each other as France and Romania is, in my book, incredibly incorrect and it feels a bit insulting, though I can't out my finger on why exactly.