Which action is legal as well as an ethical obligation of American citizens

Both jury service and the payment of taxes are legal as well as ethical obligations for American citizens.

Jury service and payment of taxes

Explanation:

Americans are united by citizenshio, by sharing values of freedon and equality. When a person becomes an American citizen, he has certain rights and obligations as a person. Some rights are: freedom of expression and religion, the right to vote in elections and to apply for employment. Among the responsabilities are to support the constitution, participate in democratic process, respect beliefs and opinions of others and defend the country when needed among others.

However, jury service and payment of taxes are legal and ethical obligations for all American citizens.