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).

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b. the american revolution