What is one responsibility that is only for united states citizens?

One responsibility exclusive to United States citizens is serving on a federal jury. While all residents may be summoned for jury duty, only U.S. citizens are legally obligated to serve if called. Non-citizens may be excused from jury service. This is enshrined in the Sixth and Seventh Amendments to the U.S. Constitution, which guarantee the right to a jury trial and specify that jurors must be impartial. Therefore, the process of selecting a jury inherently relies on the availability of U.S. citizens to fulfill this civic duty.