In a memorandum from the early pro-abortion advocacy group The Association for the Study of Abortion, the term “pro-choice” was proposed and reasons were given for why the pro-abortion movement should adopt it as a slogan.
The organization was trying to come up with a slogan to match “right to life” which pro-lifers had adopted. The memorandum says:
“The alternatives seem to be Freedom of Conscience and Right to Choose. I hope someone can think of a clearly better one but, in the meantime, let me say why I think the latter preferable. There are two reasons – the first superficial, the second, less so.