How to Say "us citizen" in Spanish
The Spanish word for “us citizen” is “estadounidense” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
resident of the United States

Examples
Ella es estadounidense, pero vive en México.
She is American (a US citizen), but she lives in Mexico.
Los estadounidenses celebran el Día de la Independencia en julio.
Americans celebrate Independence Day in July.
Gender and Articles
The word itself doesn't change, but you use the correct article (the little word before the noun) to show gender: 'el estadounidense' (male) or 'la estadounidense' (female).
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