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

Serving on a jury is a responsibility reserved to US citizens. Federal court juries and most state and local court juries are drawn only from citizens. Voting in federal elections is also reserved to citizens. Paying taxes, obeying the law, and respecting the rights of others are responsibilities that apply to all residents of the United States, regardless of citizenship. The USCIS lists serving on a jury and voting in a federal election as the two responsibilities exclusive to citizens. Jury service is fundamental to the American legal system because the Constitution guarantees a right to trial by jury, which can only function if citizens fulfill their duty to serve when called.