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

Voting in federal elections is a responsibility that is exclusively reserved for United States citizens. This right is fundamental to the democratic process, allowing citizens to participate in choosing their representatives and influencing government policies at various levels. Only individuals with citizenship are granted the legal ability to vote in federal elections, which underscores the importance of citizenship in participating in the democratic governance of the nation.

The other options pertain to responsibilities that apply to all individuals residing in the United States, regardless of their citizenship status. For instance, paying taxes and obeying laws are obligations that everyone must comply with to maintain order and contribute to public services. Similarly, defending the country is a general responsibility expected of all individuals, particularly in the context of military service or support during a national emergency, but it does not exclusively fall on the shoulders of citizens.