Final answer:
The responsibility only for United States citizens among the provided options is to serve on a jury. This legal obligation ensures that citizens participate in the judicial process by providing a fair trial to their peers. Other duties exclusive to citizens include serving in the Armed Forces and voting in elections.
Step-by-step explanation:
Among the listed options, one responsibility that is only for United States citizens is to serve on a jury. While activities such as traveling to other countries, obeying the law, and being respectful of others are broader responsibilities expected of both citizens and non-citizens, serving on a jury is a legal obligation that is unique to citizens. This duty underscores the principle that peers—a representation of a cross-section of the community—should be the ones to determine the guilt or innocence of a defendant, ensuring a fair trial as part of the judicial process.
Other Responsibilities of U.S. Citizens
Additional responsibilities exclusive to citizens include serving in the Armed Forces, when required by law such as during a draft, and the ability to vote in elections, which is both a right and a duty to participate in the democratic process. Moreover, only citizens can hold most federal jobs, become elected officials, and demonstrate patriotism through certain civic actions.
It's worth noting that while some responsibilities, like paying taxes or respecting others, are shared by all residents, only citizens can partake in certain civic duties that ensure the functioning of a representative democracy. By understanding both their rights and responsibilities, citizens can engage more effectively in public life and uphold the Constitution.