What is one responsibility that is only for United States citizens?

One responsibility that is unique to United States citizens is serving on a jury. This duty is a fundamental component of the American legal system, which relies on a jury of one's peers to ensure a fair trial. Only citizens have the right and responsibility to serve on juries, reflecting their stake in the legal system and the democratic process.

Participation on a jury is vital as it embodies the principle of civic engagement, allowing citizens to take an active role in upholding justice and contributing to the fair administration of laws. Through jury service, citizens help ensure that legal decisions are made by a diverse group that represents the community, thus reinforcing the democratic ideals of the country.

In contrast, while paying taxes, obeying local laws, and voting are all important duties, they do not solely apply to U.S. citizens. Non-citizens may also be required to obey laws and possibly pay certain taxes, and while they can sometimes participate in some forms of voting (like local elections in certain jurisdictions), jury service remains exclusively a citizen’s responsibility. This distinction makes serving on a jury a unique obligation of citizenship in the United States.