Also most successful communist movements spawned either from a social democratic movement that was resisted too much (Like the RSDLP), or from anti-colonial movements (which isn’t really relevant to the US)

The main counter example being the GDR, which came from military occupation by a communist power, which has always been what I assumed was the most likely method of getting socialism in the US, but I’d prefer to not have a global war so destructive that the United States gets occupied by China.