When I say successful here, I mean in terms of being enacted/implemented, not necessarily in terms of solving the problems they were intended to solve.
I've been reading a bit about Huey Long and his policies in the 1930s. He seems to be very far to the left of FDR in some ways and Wikipedia implies that he, along with others, was responsible for pulling Roosevelt farther to the left with things like the Second New Deal. In general it sounds like it was a popular time for liberal policies in America. But why was there a big liberal movement at this time and why was it so successful?
Am I right that follow-up questions are allowed? If so, when the word ''liberal'' and ''liberalism'' started to mean completely different set of ideas than in most european languages?
Because for me, being used to ''my'' range of meaning of ''liberalism'' it looks like a joke, when OP calls interventionism policies a ''liberal'' ones.