I am sorry we are not understanding each other. They really are simple questions:
1) How did you obtain your Residency status? Just being a Canadian and entering the U.S. does not get you Residency status.
2) What visa did you use to enter the U.S., or did you just use your Canadian passport?
That's fine that you are amused, but what amuses me is that I am trying to get a clear response from you so that I can give you a clear answer and it's like pulling teeth. It shouldn't be this hard. You say "re-apply" for a green card. You still haven't answered my first question, how did you obtain that first green card? Whether you are German or Canadian, neither can just walk into the U.S. and ask for green card status. Basically, there are 5 ways to get that status and those are the following:
1) Family - a U.S. Citizen or U.S. Lawful Permanent Resident petitioned for you.
2) Employment - A company sponsored you through a job offer or if you were nationally or internationally recognized in your field, you could self-petition.
3) Asylum - You got Residency because you would have been persecuted because of your race, religion, nationality, social group or political opinion if returned to your country.
4) Investment - You had $1,000,000 or more to invest in the U.S. and the company that you established created 10 or more jobs for U.S. workers.
5) The Diversity Lottery - You were one of 50,000 people in 1959 or so that were granted Residency through the lottery.
Now granted, in 1959 the laws might have been different and I wasn't even born back then, so I will have to do additional research on that subject, but it would help me immensely if you were to tell me, "Well, in 1959 so and so petitioned for me to get Residency." or "In 1959 I was able to apply for Residency by doing such and such."
The botXXXXX XXXXXne is that you want to know how to get Residency now and I just listed for you the 5 ways. If you do not meet any of those ways, then unless you can tell me how you original Residency status, I will not be able to do the research to tell you IF you can re-apply which I seriously doubt that you can. In the end, you most likely abandoned your Residency many many years ago. They call it "Residency" for a reason and that's because you are supposed to be residing in the U.S. to maintain it.
So hopefully we are on the same page now. Please try to let me know how you were able to obtain that original Residency status. Thank you.