To become a citizen, one can do any of the following:
- A person is born in the United States. (This grants automatic citizenship.)
- A person of foreign birth is granted citizenship after living in the U.S. for five years. (This is typically part of the naturalization process.)
- A person of foreign birth successfully completes the naturalization process. (This involves meeting certain requirements and applying for citizenship.)
- A person marries someone who is already a U.S. citizen. (Marriage to a U.S. citizen can expedite the naturalization process, usually requiring three years of residency instead of five.)
So all options listed can apply.