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The US is only such a powerhouse, because they generally have the support of their allies. That makes it the unparalleled biggest economic block in the world.
But without their allies, USA isn’t that much stronger than China economically. And USA wouldn’t be nearly the powerhouse they’ve gotten used to be.
So China just has to look on and do nothing, while USA is losing their world dominance quickly.
To be fair, in the last frame dad is not pretending.