Very interesting.  On a similar note, John Donohue and Steven Levitt theorized that the result of Roe v. Wade and the resultant availability of abortions resulted in a drop in crime beginning roughly 18 years later: 
<a href="http:&#x2F;&#x2F;pricetheory.uchicago.edu&#x2F;levitt&#x2F;Papers&#x2F;DonohueLevittTheImpactOfLegalized2001.pdf" rel="nofollow">http:&#x2F;&#x2F;pricetheory.uchicago.edu&#x2F;levitt&#x2F;Papers&#x2F;DonohueLevittT...</a>