Eli5: Why was it world-changing that Caesar crossed the Rubicon?
In: 1397
It wasn’t world changing. He took an action that was irrevocable. When people use the idiom “to cross the rubicon” it has a similar meaning to “the cat is out of the bag” or “you can’t unring a bell”. When Ceasars crossed that river and brought his troops into Rome, he broke a sacred taboo and started a war whether he wanted to or not.
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