What is one promise a person makes when they become a U.S. citizen?

When a person becomes a U.S. citizen, one of the key promises they make is to be loyal to the United States. This loyalty is a crucial aspect of citizenship, reflecting a commitment to uphold the values, laws, and principles of the nation. The Oath of Allegiance that new citizens take explicitly expresses this loyalty, as they pledge to support and defend the Constitution and the laws of the United States against all enemies. This promise of loyalty fosters a sense of unity and responsibility among citizens, ensuring that they are committed to the welfare and integrity of their country.

Other options, while they may relate to responsibilities or expectations of citizenship, do not represent a formal promise made during the naturalization process. For instance, speaking multiple languages is beneficial but not a requirement or promise of citizenship. Paying taxes is an obligation for citizens but is not stated as a promise during the oath. Similarly, serving in the military is not mandatory for all citizens and does not constitute a promise made upon becoming a citizen. Thus, loyalty stands out as the definitive promise inherent in U.S. citizenship.