One result of the expanding railroad system was that?
A:)Native Americans were able to protect the buffalo on the plains
B:)The mining and meat-packing industries developed.
C:)Chinese immigrants could leave new England and move west.
D:)The panama canal became less important for trade.

please help

the number of senators, and representatives, the state has in congress.

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.