In which of the following areas is there a large concentration of American Indian and First Nations peoples? A. the interior west of the United States and Canada
B. the Atlantic and Pacific coasts of the United States and Canada
C. the Great Lakes region of the United States and Canada
D. the Atlantic coast of the United States and Canada

c can be d answer for following question

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

idk