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Pretty much what it says on the tin, but:
Starting any time after 1929 (somebody other than Hoover wins?).
Gun Control Act of 1934 never happens, so Thompson SMGs remain legal over the counter for anybody.
Gun safety training is mandatory in all schools for all students
Gun safety training is required to be maintained for all adults, on penalty of fines.
Firearms licences are required: proof of passing safety class is necessary.
How do you get a U.S. where that is the standard? I'd imagine no Drug War, for a start. No Prohibition might be required, tho that would seem to predate my proposed earliest POD.
I'm taking as given, contrary to the views of gun control advocates, firearms are inanimate objects incapable of committing crimes on their own.