It didn’t have a different meaning, this is not like the swastika which is an Asian symbol that was co-opted, this is a European symbol that always stood for one of the core ideals of fascism, even before fascism coalesced as an ideology. Stop trying to make false analogies or excuse the US’s clear proto-fascist ideological underpinnings. It is no coincidence that the Nazis openly admitted to taking inspiration from the US in their genocidal, expansionist settler-colonialism.