As to the reason why the U.S. went from having a 70-90% tax rate on the highest earners to sub 40%, I have no idea for the change. I just know it happened around the time RR was in office, i.e. Trickle Down Economics. I'm sure more money in the coffers of the rich is the reasoning but that'll be an uninformed opinion of mine.
All your opinions thus far are uninformed.
I will say up until the 70s/early 80s minimum wage increased along with productivity and since then while productivity has skyrocketed, the minimum wage in terms of purchasing power has remained the same. If it had kept increasing with productivity you would likely have a minimum wage around 20/hour, i.e. enough for there to be a solid middle class.
It's a natural consequence of womens'
liberation. When you all of the sudden double the work force, but keep demand the same, the inevitable result will be an overall halving of income. You double supply but keep demand the same, with the benefit being "doubled" productivity.
Instead of the husband going out to earn a living for the entire family, both parents go out to earn in income, but they still only
need one house, one refrigerator, one TV, one couch, one master bed, etc.
Anything a socialist or democrat socialist or whatever you want to consider yourself proposes to help the poor or middle class in all actuality only hurts it. Your only benefit is misery loves company; there's much less people to be jealous of because you're all in the same boat more or less, which is precisely what happens in Europe. You are paid 30% less for the same work you do, taxed 50% more, and everything costs 20% more such that their
stronger broader middle class is significantly poorer than ours. And they still have their
rich coffers investments dispersed providing jobs/liquidity too, difference is they weren't made by some kid who figured out the operating system your computer uses, designed/invented the phone in your pocket, or in an attempt to totally revolutionize the automobile industry to such a degree he can punt a car into space for hobby. All that benefits you, but unfortunately does nothing to ease your jealous misery that no one wants to pay you millions of dollars to sell yoga pants.
Your anger should be directed at the teachers/professors/those around you who taught you how to think so poorly, not the evil rich or some guy on the internet who posts a meme of ridiculous statements indistinguishable from verifiable ones.