Why does Resiner suggest that the long-term sustainability of the south-western United States is precarious

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; transportation, store's,a whole lot more of ugly people,ect

answer; ( insanity );

i believe that's b. popular sovereignty