What is one responsibility that only applies to U.S. citizens?

The responsibility that specifically applies to U.S. citizens is voting in federal elections. This duty is unique to citizens because it is a fundamental aspect of participating in the democratic process. Only individuals who are citizens have the legal right to vote at the federal, state, and local levels, which allows them to influence the selection of their representatives and the direction of government policies.

While paying taxes, obeying laws, and serving on a jury are also important responsibilities that apply to both citizens and non-citizens (with some exceptions in specific contexts), voting is exclusively reserved for U.S. citizens as a means to ensure that those making decisions about governance are fully part of the social contract of citizenship. This distinction highlights the unique rights and responsibilities that come with citizenship in the United States, reinforcing the role of citizens in shaping their government and community.