Whenever the United States fall into strife, quips and stories about the fall of Rome follow naturally. If Rome fell, why not the US? Indeed, it’s quite logical given that no empire in the history of the planet has ever been permanent. Nations with a long imperial heritage, particularly Egypt and China, were not only reconstituted from scratch several times they both have rejected imperial trappings today.
More to the point, the United States is not an Empire to start with.
There is a more interesting period of Roman history, however, which is when it transformed from a Republic to an Empire. It’s a topic shrouded in complex political machinations that become difficult to understand. But they are indeed worth knowing.