Why is answering all these questions helping my brain becomes smart?

Answering questions exercises your brain so the more you think the smarter you are getting in a way. But they also help you focus and find inspiration for your work. For example, when my brain is slow i answer a few questions on to help me start thinking clearer.  

Explanation:

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first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.