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

The responsibility of serving on a jury is unique to United States citizens because it is a fundamental aspect of participating in the judicial system, which underlines the rights and responsibilities of citizenship. Jury duty ensures that legal cases are decided by a group of impartial citizens, reflecting a fair and equitable trial process as established in the Constitution.

While paying taxes, voting in elections, and running for public office are all important civic duties, they can be obligations or rights applicable to certain residents, depending on the local laws and the status of residency. For example, in some jurisdictions, legal residents may be allowed to vote in local elections, and non-citizens may even find themselves required to pay taxes under certain conditions. Only citizens, however, are mandated to fulfill the duty of jury service and engage directly in the legal processes that uphold the justice system.