The Scandinavian countries have had, until recently, very successful national socialist states.
It is a fact that that is what they are (were), and it is also a fact that you can’t use that entirely correct description because of its historical connotations.
The collapse of their states, which is ongoing, simply proves that socialist schemes can only work among a people which conceives of itself as a large extended family (i.e., a NATION), and that the family members will not happily work to provide bread to strangers.
The Scandinavian countries also exposed a HUGE shortcoming of socialism (national or otherwise): Very low birthrates that make it unsustainable. Europe’s people are disappearing for this very reason, and now Americans are as well.
Socialism does not work in any form. Never has and never will.