Somebody please answer ASAP September 1st, 1939 World War II begins. Britain and France declare war on Germany. What does Russia (USSR) & The United States do?

they dint do a war yet so keep working and serching

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; automatic fire suppression system;