Of course if those 50 million had been born, many others. probably wouldn’t have been. Children conceived and carried during the lost estation and maybe a year or so after the aborted children would have been born almost certainly would not have been conceived.
Then again some of the aborted children may well have ended up as miscarriages.
Some act as though our population would be swelled by 50 million had no one aborted their child - but probably, I don’t know, half as much.
This is not to defend abortion in any way. Just to point out a more factual result of its legalization.
So that's about 12 million who would have added another 22 million or so to the population right about now, in addition to say 45 million assuming a really high mortality rate for the U.S. (10%) on the total population of non-aborted children.