Unilaterally pushing up nominal interest rates is trivially achieved by rising inflation by devaluing currency by printing lots of it and spending it on pretty much anything. It would pretty much instantly hike up the nominal yields on pretty much everything USD-denominated to match the (now) higher inflation.
It doesn't mean that it's a good thing to do as it has all kinds of other effects, but in general the governments have the ability to do this should they choose to, it's just that they keep pinky-swearing that they won't do it, making legislation that makes it tricky to do without consensus (but they can repeal that if both parties agree that it's the way to go) etc.
It doesn't mean that it's a good thing to do as it has all kinds of other effects, but in general the governments have the ability to do this should they choose to, it's just that they keep pinky-swearing that they won't do it, making legislation that makes it tricky to do without consensus (but they can repeal that if both parties agree that it's the way to go) etc.