What were some of the advancements that happened during the Pax Romana

- There were huge leaps in engineering, to construct more sturdy roads more efficiently to support the huge empire in transporting materials.

- Architecture. To show the glory of the Pax Romana, and to improve the lives of citizens, huge structures like the Colosseum and Pantheon, along with public baths and basilicas, were built. This required leaps in architecture, and they still stand to this day.

- Military System. To properly defend the huge empire, the Romans managed to set up military outposts and systems of networks across the empire to transport soldiers quickly and set up quick communications. This system has greatly affected military systems later.

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this is a good question! i'll do some research and come back when i have the answer!