To become a U.S. citizen, the following options apply:
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A person is born in the United States - This grants automatic citizenship (jus soli).
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A person of foreign birth is granted citizenship after living in the US for five years - This is generally part of the naturalization process, where an individual may apply for citizenship after meeting residency requirements (typically five years for most immigrants).
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A person of foreign birth has successfully completed the naturalization process - This grants citizenship to those who meet the necessary requirements and pass the naturalization exam.
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A person marries someone who is already a US citizen - This can lead to a pathway for citizenship through marriage, generally allowing the foreign spouse to apply for naturalization after a shorter period of residency.
All four options listed can lead to U.S. citizenship.