This would fundamentally collapse the US economy. And while it would cause disruption for the rest of the world, it wouldn't be that much disruption for that long in comparison. The rest of the world can ramp up production, innovation, and all kinds of resources both natural and human, to take care of itself. The rest of the world doesn't need the US to look after it - so don't believe the hype.

It's impossible for the entire world to unite against the US. The US would anticipate this and prevent it. Let's assume all countries aligned against the US. First, US stock markets, then Asian and European stock markets, would begin to crash. Because the US led the way, a food and fuel crisis would emerge. Massive waves of migration would occur. Poverty would rise. Social unrest would ensue.

On the one hand, China, and on the other, Russia would begin to occupy any territory they wished. A major war would break out in the Middle East. The dollar is heavily used in world trade, and global trade would likely stagnate.

According to my scenario, a major crisis awaits the world. The entire world is in no position to cope with this crisis.