I'd say you're right that working conditions were a factor they were bragging about, but I'd say the context is specifically to contrast with the image of non white 'sweatshops.'
Also from what I can find the non white (including mexican/latino) population in CA around that time was around 12% and I'm sure white supremacy was hardly their 'default position'.
This I disagree with. There is polling from the 40s for example asking if blacks should have equal chances to get any kind of job, 54% said yes. This is during/post ww2. obviously it was becoming more accepted but I don't think it went from drowned out and non existent to 54% in less than a decade.My response to that interpretation is what actually compelled me to start this line of reasoning. Namely: white supremacy was the default position for all of the United States in the 1930s with very very small and secluded pockets of exception (none in LA that I know of but there was some kind of a jazz culture in LA so I'll speculate that there were some voices of dissent). Those "contemporary voices" you talk about where so far drowned out as to be non-existent: most particularly in a world where even access to a radio was relatively new and expensive. You had to be in a specific sub-culture to hear any messaging whatsoever about desegregation or racial equality.
Also from what I can find the non white (including mexican/latino) population in CA around that time was around 12% and I'm sure white supremacy was hardly their 'default position'.



