Nominally the U.S. minimum wage was $1.60 in 1969. So $15 is a little high but not to bad.
Inflation isnt tbe only thing here. Take into account the tax burden and how it has increased on every business paying the $15 per hour. This is foisted upon business by by the gov which increases the payroll tax and increases expenses dramatically.
“50 years ago min. wage adjusted for inflation in 1969 was $11.14.”
If you are quoting government inflation figures bear in mind that they greatly understate the true inflation rate. Fifty three years ago I bought a new Mustang for three thousand dollars and I overpaid. There were plenty of houses for sale in this area for less than twelve thousand dollars and they were not shacks, they were small brick houses, usually with a masonry fireplace and chimney as well as a central heating system. I don’t think you can build the chimney and fireplace now for twelve thousand.