Sorry have to ask ,where did you get the idea that the things you listed are socialist, they are not in any way socialist. There is only one way that Marxism, socialism and communism is implemented and without this there is no socialism , Marxism or Communism . It is the prime tenant and that is the means of production is owned, operated and controlled by the state and the sale of that production is designated to the state. This has never happened in this country and it never will unless it would be because of the actions of the right wing.
Wrong.
Socialism, communism, and maxism do not at all require state ownership of anything.
The point of socialism, communism, and marxism it to figure out how to avoid the inherent slavery of capitalism.
When profits are the only motivation, instead of any human value like rights, then the combination of economic power, makes it inherently dangerous.
And there are many ways socialism, communism, and marxism suggest avoiding the dangers of capitalism.
State ownership of means of production is only one of them, and even that does not preclude private ownership of means of production, as long as it is not a monopoly.
And of course socialism, communism, and marxism has existed in the US.
The Post Office, schools, SS, roads, families, NASA, NOAH, DARPA, etc, are all socialist, communists, and marxist.
The fact we only do socialism, communism, and marxism with limited and unprofitable ventures, is not relevant.
We likely should do far more socialism, communism, and marxism.