> 1. Millions of women entered the workforce (started when all the men were overseas fighting)
The rate of women in the workplace ticked up slightly during WW1 and WW2, but by no means was it a sea change. That's a narrative pushed by "traditionalist" thinkers that found a simple thing to pin social upheaval on
The real change was accelerated industrialization during the first half of the 20th century. Millions moved from farms to factories, men and women alike.
> 2. The government went off the gold standard
So what?
> Going off the gold standard kicked off massive inflation.
If you call a steady 1-2%/year "massive".
The real effect has been to stabilize the economy. I guess people who like gold standards don't know their economic history. The 19th century, which is arguably a recognizable modern economy (in the West), was punctuated by panics and strong recessions that made the "Great Depression" look tame. (which itself makes the Great Recession look pretty tame.). Getting of the gold standard was key to fixing that.
> 3. Millions of people in other countries replaced the workforce via globalization
I agree with you here, but again I think you overstate the impact. The US was once in the position of SE Asia today: (relatively) educated workforce, cheap labor, lax standards compared to Europe. In it's time, the American South was the jobs-export market for the North. These trends have been happening basically forever.
More importantly, the remaining manufacturing jobs, and there are many, are high wage and high skill. They're also high productivity, so there are fewer.
That leads to another force at work, which is a bigger threat than exported jobs: automation. Most manufacturing jobs didn't leave, they disappeared.