Which geographic factor most directly influenced the rapid settlement of the Great Plains after the Civil War

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

this question does't support enough resioning to answer.

answer; i believe the answer is 80%, plz check first good luck;

quote is the answer your looking for.