> I thought it was WW2 and the lack of men to do the jobs they usually would.
That doesn't track the reality of the timeline of women in the workforce. Women temporarily worked during WW2, and after the war things returned to the previous status quo. Women weren't common in the workforce until the 1960s. It wasn't until 1967 that women's labor force participation broke 40%[1] but then it pretty quickly hit 50% by 1978.
"Women's liberation" is what brought women into the labor force. That doesn't mean it "ruined America", it just means the approach had flaws that need to be iterated on.