...but Unions and union-backed political parties are who won all of these benefits in social democracies?
You seem to have the entire thing backwards: the failure to build and grow unions in the US has resulted an absence of power and political representation for working people. Without this counterbalance, the rich and corporations have used the state to enshrine benefits for themselves and total power over workers.
Don't you think that if we have to have unions to achieve political representation -- there is something really wrong with our political process. If I am in a party and / or a union - how does that (not) help with representation? Why do I even have to be in the union to be represented?
Collective problems require collective action. We aren’t born into a just or meritocratic world, but one defined by the wealthy and powerful, who themselves form blocs to defend their interests. You can certainly try to take them on by yourself, but history suggests you won’t be very successful.
You seem to have the entire thing backwards: the failure to build and grow unions in the US has resulted an absence of power and political representation for working people. Without this counterbalance, the rich and corporations have used the state to enshrine benefits for themselves and total power over workers.