The first return of jews from exile was led by zerubbabel in 536 b. c.

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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

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;