I'll also point out that before income taxes, America was not a particular "world power"
Most folks would point to the 1950's+60's or so as the height of American wealth and dominance. Income taxes passed on 1913, a year before WWI.
I mean, at that point we were like, 50 years out from slavery being illegal. And there's a lot to be said about how that particular practice enriched certain sectors of the country, as unpaid labor will tend to do.
Before income taxes, we didn't even have the federal reserve. Each bank would print out it's own debit notes and you could never be sure that your New York issued dollars would be honored in Kansas, or even if the exchange rate for "dollars" would be the same.
So, folks tended to use gold and silver. Except that required large, heavy reserves and currency production was so limited that it couldn't scale with a rapidly scaling economy.
Not only that, but individual companies started building towns where their workers would live and work, and all their wages would be paid in "scrip". That could only be redeemed at company stores within the town. When profits dipped, the company would raise prices in the general store so folks couldn't buy as much with their wages. They would decrease costs by buying less product for the store. Like a little microcosm of inflation.
Not only that, but before the income tax and federal reserve, there were localized, depression-level crashes like...once every couple of years. Currency was so scarce and banks would over-leverage themselves, then folks would get wise to this fact and try to take all their money out. A bank collapse was devastating, and they would happen with regularity.
America wasn't richer back before those days. Wealthy people were richer back in those days. That was the era of Robber Barons and violent repression of organized labor. People worked 80 hours a week in unsafe conditions and lived horrific, squalid lives.
Nah dude. Nah. Nah uh. Trump says *those* were the good old days? Sure. If your last name was Rockefeller or Carnegie. Everybody else got the shaft.
Quite literally, as it turns out.