I am putting this informative comment into a post where it will garner more attention.
I wanted to share my brother’s and my experience today of applying for US citizenship at the Toronto Consulate. We are both Canadian born children of a US parent who is now deceased. Given the information we have taken from the internet, IRS and US citizenship sites, we came to believe that we had to obtain US citizenship (we were never registered as born abroad by our US parent). We completed all the paper work, obtained the documents and booked the appointment and attended for that today. We were to be granted US citizenship, however when we advised them that we actually did not wish to obtain the citizenship and in fact the only reason we had come was because we believed the US required it of us they were dismayed. We were told by the consulate officer and her direct superior that they cannot force anyone who is born outside of the US to acquire citizenship – it is a choice. When we pressed her further stating that this is not the information we are getting she advised clearly that we are not US citizens unless we willingly apply for and accept the citizenship. She stated we can say unequivocally that we are not US citizens unless we wish to be. We respectfully declined the offer of citizenship (to their amazement) and left with our refund and documents in hand. I will certainly sleep better and breathe easier! I hope this helps other Canadian born who are concerned about this.