A reason for that, was women still weren't in the workforce to the degree they are now. More women in the workforce means a higher supply of labor, meaning downward pressure on wages.
If the minimum wage is $3.00 per hour, then any additional workforce must be paid that same amount per hour. Period.
I think you are just flailing around trying to not have to come to grips with the fact that minimum wages are legal, and a good thing, and even better if a livable amount.
Minimum is the operative term. If 1 Billion women join the workforce, and the Minimum wage is $3.00 per hour, what is the least amount the women must be paid per hour??? (This is NOT a trick question!) The answer is $3.00 per hour.
Downward wage pressure may indeed impact wages above the minimum wage. Which is why the HB1s