Of course, they were massively out-propagandized by special interests who benefit from government restrictions on voluntary interactions, and so the free market is extremely unpopular, with all trends — e.g. the rising degree of regulatory of centralization as measured by per capita regulatory compliance costs, the rapid rise in social welfare spending as a percentage of GDP since 1950, etc — demonstrating that.
>>since 100 years is 1923, so any proof at that point was just leading into Depression.
The Federal Reserve, i.e. the central bank, created the Crash of 1929, and it was Hoover and FDR's government "cures" that turned what would have been a short downturn and quick recovery into a Depression.
Hoover's role:
https://www.eurekalert.org/news-releases/842709
FDR's:
https://www.google.com/amp/s/www.ff.org/fdrs-policies-prolon...
At one point, the FDR administration was paying farmers a sum equal to $500 million today, to kill and bury five million baby pigs:
https://footnote.wordpress.ncsu.edu/2020/08/14/plowing-under...
This while people were going hungry.
The FDR administration, economically illiterate ideologues as they were, believed that the problem was low prices, and that by reducing the supply of agricultural products, they could push up the price, and end the depression.
In reality, the money supply had contracted due to cascading loan defaults, and what needed to happen is for prices to adjust downward to come in line with wages.
The FDR administration instituted a number of measures to try to control prices, to horrible effect on millions.