The proposition that facial expressions of emotion are innate is supported by the observation that blind children show different facial emotional expressions than do sighted persons. facial expressions of emotion vary by culture. the same facial expression for an emotion is observed in all cultures. facial expressions of emotion change over time in a culture. some facial emotion expressions are only expressed in adulthood.

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

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.