The example shows how the Roman Empire and the United States are comparable in that both have laws that are written to make clear what is permitted.
In order for people to know what was and wasn't allowed in Rome, it was common practice in ancient Rome to post both new and old rules in the open. They could avoid breaking the law and using their excuse of ignorance in the process.
This is comparable to how the United States prepares laws so that everyone may access them and comprehend what is and is not permitted there. They were able to avoid committing crimes as a result of their ignorance.
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