In order to become a U.S. citizen, all naturalization applicants must meet the following requirements (unless they qualify for an exemption or apply based on their U.S. military service):
Be of the minimum required age (typically, at least 18)
Continuously and physically live in the United States as a green card holder for a certain number of years
Establish residency in the state or U.S. Citizenship and Immigration Services (USCIS) district where they intend to apply
Have “good moral character”
Be proficient in basic spoken and written English and demonstrate knowledge of U.S. history and government
Register for military service (if a male of a certain age) and be willing to perform civil service when required
Swear allegiance to the United States