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Why didn't the late Roman Republic build a new wall to replace the Severan Walls to wall off the entire city from attack? After all usurpers and generals away from Rome were gaining in influence and power after 100 BC. It would have made sense for the Senate to build the wall to consolidate their power and position in Rome, enhance stability and to defend it in case of a civil war.

How would Roman history and in particular Caesar's civil war have changed if Rome was completely walled off and well fortified? Would Caesar still have defied the Senate and crossed the Rubicon?
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