The US is the second largest manufacturing power, the largest economic power and the largest military power, but those things aren't even what makes it a scary threat.
There are things that make up the US that vastly increase its potential for self-organization when it is given an organizing principle. Yes, dynamism has taken a hit over the decades, but there are also a lot of aimless purposeless people right now that do have an appetite for purpose if given one.
Major modern countries today have red lines defined that they won't cross in order to keep the peace. Russia says don't attack Moscow or otherwise attempt to replace their government or they will nuke you. Nukes do change the structure of future wars between nuclear powers, which might actually make some aspects of it less extreme.
If Ukraine had nukes, they could have a red line like, "If you keep hitting hospitals and schools, we will nuke you. Powerplants and railroads we understand, but if you show us with your actions that you have no mercy for the weak and innocent, we will end you." Instead, they have nothing of the sort.
All the US has to do is wait for the enemy to make catastrophic moral failures and it's game over, because it rallies the people, the companies, the innovative talent, the allies, etc to reject it with force. It crystallizes the purpose.
We are energy independent and are advancing even more ways to expand the dimensions of that. You can't destroy our government, because we'll just recreate it.
We're forcing our allies to become more independent, because they got too soft and we need them hardened up. That only makes the US stronger, because strong allies are better for all of us. It makes us a better deterrent against war happening in the first place.
Meanwhile China is surrounded by countries that dislike it and don't trust it. Giving Canada and Mexico tough love is no comparison to the fundamental failures in the relationships China has with its neighbors in their region.
India is far more US aligned than with China, regardless of tensions. Neither North Korea nor Russia trust China, but they are forced to deal with it despite the buddy-buddy optics.
Failing to benefit from so many possible optimizations at the basic strategic level in their local region, any confidence in a favorable outcome for the CCP seems misplaced. Their failings probably cascade down into the other levels of preparation as well.