Female infanticide in ancient cultures, right? Because sons were thought, at the time, to be more valuable.
Abortion is the right of the mother, of course. Her choice, with maybe a little input from the doctor, if she feels like consulting such doctor. This one agrees with that.
What if, though? It's 2210, and abortion is legal and free everywhere, but in practice, expectant mothers only ever choose it in the week after the first sonogram, once they've determined whether the baby-to-be is female or male. If the sonogram identifies a male, on goes the pregnancy. If the sonogram identifies a female, they make the choice to abort, and go on with life.
Does that begin to raise any problems with the idea of legal abortion?
What if it happens a billion times over the course of a century? What if, through the completely free and liberated choices of expectant mothers, the women of the twenty-third century just decide to abort 80%, or 97%, of female fetuses? Does that make us rethink, in any way, our idea of choice?
When sonograms get good enough to reveal height, good looks, eye color, susceptibility to disease, or sexual deviance, what then? When the United Mormon Alliance (UMA) controls the planet, and only blue-eyed, crew-cutted, 6'2" straight males are born, under an enlightened regime of abortions for all, and the remaining women argue against critics that they are exercising their God-given, enlightened right to control their own reproductive functions, what then?