My wife has a US passport but was adopted from Canada. Does that mean that she is a US citizen?

Posted September 22nd, 2010 by immigratecanada and filed in Immigration to Canada

My wife was born in Canada, adopted by an American family. She had always assumed that they did the paperwork that they needed to do because she’s had 2 US passports. Recently when speaking to her mother; her mother stated that she had never filled anything out for the Immigration and Naturalization Service. We HAVE been married for 9 years. Because we’ve been married and she has 2 US passports (both expired, one recently) is she a US citizen or do we need to dig deeper?