Just to put this pointless discussion to rest (for me, anyway), here's my final comment on it.
1. I am aware that the country is called the United States of America. It is never referred to as the US of A. It sounds like something Archie Bunker would say. I wonder if that's where it originated?
2. I looked up that abbreviation. It is not even included in any of the lists of abbreviations that I could find, although it is mentioned one time, as a "colloquial" expression. But nowhere is the term listed as a serious abbreviation for the country's name, either inside or outside of the country.
3. More to the point, I have never read one positive thing about the U.S. from Marg. "The US of A" is always followed by a superior, gloating comment about how awful life must be for us poor people living in the lower 48, how we can never leave our homes without being armed to the teeth, everyone is "packing" all the time, and so on. None of this is true anywhere in the country to my knowledge unless you happen to live in a crime-infested neighborhood (and she has been told this also by various people, but it doesn't stop the constant sniping), and the sarcastic abbreviation is part of the whole shtick.
Here's just one example of the anti-American nonsense, right here in this thread:
Because you live in the USofA, you just allow everyone to walk on you?
Is that what the gun-culture in the USofA has created? Everyone living in fear? Afraid to say anything or stand up to anyone?
Of course, I am also aware that we have a gun problem, and plenty of other serious problems, such as the political split that has almost turned us into two separate countries, the racism that seems to go on forever, some very nasty religious differences, our slowness in responding to Covid, and many others. I am not a flag-waving goody-goody. But in spite of its problems, I really do love this country. It has been very kind to my family, and I am so glad that my grandparents had the good sense to emigrate here when they did. And it's very annoying, to put it mildly, to keep seeing negative, and largely untrue, statements about the U.S. being made up out of whole cloth, or perhaps mindlessly repeated.
I doubt that Canada is a perfect Utopia. But I don't make up nasty nicknames (well, I did it that one time to prove a point, but I don't usually refer to Canada as CanofAda). Why the childishness? We are supposed to be a "friendly" discussion group, and as seniors, we ought to be showing some maturity. How about some respect for the places where other people live?
By the way, Marg, you and I are on the same page about the Second Amendment. If you just cut out the sniping and the ridiculous descriptions of life in this country, we'd be allies.