If there were to be a nuclear attack on the U.S. by another country what places in the U.S. would they strike?

So I have been keeping up with the news on Ukraine and Russia and I saw that Russia says that any country that interferes with what they are doing in Ukraine will face "consequences they have never seen." I also saw earlier today on the news something about Joe Biden and how the U.S. won't stop and that if Russia keeps getting bolder they will step in more and more. So seeing this makes me think that this situation may escalate further and possibly affect the U.S. in a much more severe way. If a nuclear war were to break out and the U.S. were to get nuked what parts would get nuked and why and which ones most likely won't get much nuking or will be unaffected?