For Plato...
Obeying the law.
For US Civics studies, here are some civic responsibilities:
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volunteerism
It is a citizens responsibility to live within the law, maintain their personal property in good repair and observe civility when dealing with others. It is a duty to serve on a jury, to vote, to report violations of law.
Following the law and stoping at red lights to keep the other citizens safe
They don't have to because it is a civic responsibility not a civic duty for an American citizen
liberty, individual responsibility, equality, democracy, and civic duty