Which demographic challenge is europe currently experiencing

An aging and decreasing population

Explanation:

Europe's Shrinking, Aging Population. ... The population group aged 60 and older is expected to grow from 18 percent to 30 percent in the same period. These demographic shifts are caused mainly by two factors: declining fertility rates and increased life expectancy

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

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