Membership in a based on age and place of birth, subjects people to influences based on historical events (history-graded influences).

cohort

Explanation:

A cohort refers to a group in which the members have similar characteristics or share experience at an specific period. People who are members of a group in which they have in common the age and place of birth are influenced by sociocultural events they have lived because they are all in the place where they have occurred. Acording to that, the answer is that membership in a cohort based on age and place of birth, subjects people to influences based on historical events (history-graded influences).

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; (b) knowledge based summaries of our beliefs and feeling about the self in particular domains;