Canadian Citzenship Questions

If my mother was a born Canadian and my father a born American, and I was born in the US while my mother was still a Canadian, do I have dual citizenship in the US and Canada? Or am I still just an American citizen?When my mother later became a naturalized American citizen, would she have retained her Canadian citizenship and have dual citizenship?My mother's social security card recently turned up missing, and when I was gathering the documents to apply for a replacement I discovered that she didn't become a naturalized US citizen until after I was born.My interpretation of what I've read online makes me think I have dual Canadian/US citizenship, and I was thinking of applying for a certificate of citizenship, but before filling out the forms and paying the application fee I thought I'd check opinion out there.--Percy

Thanks for all the answers. It's not impossible that my mother renounced her Canadian citizenship when she became an American. She no longer remembers, but she wouldn't have done it on her own, it would probably have depended on what the US rules were at time. Nonetheless, I'm contemplating applying for a citizenship certificate and paying the $75 fee. There doesn't seem to be a way to ask the question, "Am I a citizen?" without going through the application process.--Percy

My wondering about whether I'm a Canadian citizen might turn more serious after November.--Percy