The population was healthier back then and we were going through a baby boom. Yes. We have over 300 million people today. But how many millions are in that 18-25 age group? Plus they all play fortnite (video games) so they are not as fit as they were 20, 40 or 60 years ago.
I don’t understand your nitpicking which doesn’t explain much of anything, or why you are trying it.
With Polio, tuberculosis, and all of the old diseases, malnutrition, rickets, and all that used to exist we could put together millions of effective troops.
I did say that “It is obvious the left is destroying our ability to hold our own in the world and protect ourselves.”
That meant in all ways, as they break down our families, our culture, our education system, and our military, it is all part of the mix of why we can’t find enough men out of 335 million people, not to fill a WWII military or a Civil War military, but a small military largely made up of people sitting at desks and holding clipboards.