Final answer:
Attending school is not exclusively a duty of U.S. citizens, while voting, paying taxes, and serving as a juror are tied to citizen responsibilities. Citizenship is crucial for total participation in the democratic process.
Step-by-step explanation:
Among the duties of U.S. citizens, the one that is not exclusively tied to citizenship is attending school. While voting in elections, serving in court as a juror, and certain government roles are legally required or entitled to citizens, attending school is a requirement for resident minors regardless of their citizenship status.
U.S. citizenship is necessary for participating fully in the democratic process, such as voting, which is a critical civic responsibility. Voter registration in the United States is primarily a state responsibility, with varying requirements regarding residency and identification. All citizens are morally and legally obligated to pay taxes and support the government's efforts both domestically and abroad.