Eli5: Why was it world-changing that Caesar crossed the Rubicon?

Question

Eli5: Why was it world-changing that Caesar crossed the Rubicon?

In: 1397

Answer 1

“Crossing the Rubicon” has become an idiom for “point of no return” – once you do this the cascade of events will begin and you can’t stop it.

When Caesar marched his armies across the Rubicon and towards Rome the intentions were clear – he was instigating a civil war to install himself as Emperor of Rome.

You can’t undo such an action, it would either end with Emperor Julius Caesar or Beheaded Julius Caesar.