My wife is from Canada and has lived here since 2002. We got married in Louisville and she is still not a U.S. citizen. She is a permanent resident and carries a "green" card. You do not become a U.S. citizen automatically when you marry a citizen. You have to go through immigration and a lot of paperwork to become a permanent resident, then depending on what country you come from, you have to wait a specified time (usually 3-5 years) to take the citizenship test. If you have a child in this country,