What would the world look like in 10 years if the United States were to cease to exist as a nation?

I’m listening to a podcast by Dan Carlin Hardcore History. He’s talking about the fall of Assyria which happened over a relatively short period of time. Assyria was the world’s superpower at the time and in 612 BCE it’s capital, Nineveh was sacked. Within 5 years the empire had fallen.

Assyria was the world’s superpower at the time and he likens that fall to the fall of the United States and the massive power vacuum.

So, let’s say there is another US civil war, say tactical nukes are used, and the US breaks apart into smaller insular states and withdraws from the world stage. What would the world look like 10 years after?