The 1970s had a whole different level of poverty than we have in 2026. As in, the normal poverty of the 1970s largely doesn't even exist today in the US. The poor today would have been middle class back then, ignoring differences in technology. The standard of living is not comparable.

A single minimum wage was definitely a poverty wage in the 1970s even at the 1970s standard of living. I have no idea where you would get the idea you could raise a family on that.