Brucejoel, the article you cited noted:
In 1967 (DC note: i.e. just before the states began liberalizing their abortion laws), researchers confirmed this estimate by extrapolating data from a randomized-response survey conducted in North Carolina: They concluded that a total of 800,000 induced (mostly illegal) abortions were performed nationally each year
Snip
In deciding Roe v. Wade in January 1973, the U.S. Supreme Court ruled that restrictive state abortion laws were unconstitutional, thereby legalizing induced abortion throughout the country. As a result, the number of legal abortions increased to almost 1.6 million in 1980.
It doesn't seem all that unreasonable to surmise that legalizing abortion materially increases the number of abortions based on those figures.
Not only is this a reasonable assumption; it is part and parcel of most pro-abortion arguments, particularly those advanced in the years before Roe.
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