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

Jury duty is a responsibility that is uniquely and explicitly required of United States citizens. This civic duty plays a crucial role in the judiciary system, as it ensures that legal cases are decided by a group of peers, reflecting the community's values and standards. Only citizens can serve on juries because they have a vested interest in the laws governing their society, having the rights and responsibilities that come with citizenship, including the ability to vote for lawmakers who create those laws.

While paying taxes and obeying local laws are also important responsibilities, they apply to all residents, regardless of citizenship status. Voting, although primarily an activity reserved for citizens, can sometimes include other qualifications or registrations that may extend to resident status in specific contexts but is ultimately a right and duty held specifically by citizens during elections. Therefore, jury duty stands out as a clear responsibility that only United States citizens are mandated to fulfill.