Why were these people called carpetbaggers?

The term carpetbagger, used exclusively as a pejorative term, originated from the carpet bags (a form of cheap luggage made from carpet fabric) which many of these newcomers carried. The term came to be associated with opportunism and exploitation by outsiders.

Explanation:

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.

because this was the year that the state of israel was formed