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Re:Divergence in U.S. Sex Ratios by County, 1820–2010 by dajohnson89 on Thursday May 07, 2015 @03:32PM (#9507662)
Also worth considering, is whether men are more likely to emigrate than women.
Re:Divergence in U.S. Sex Ratios by County, 1820–2010 by joe_the_user on Thursday May 07, 2015 @04:02PM (#9507874)
Indeed,

The graph is almost an essay in "how little raw data can tell you". Are the areas of more women from emigration, age, areas from which many men have been taken to prison, something else?

Re:Divergence in U.S. Sex Ratios by County, 1820–2010 by _random_ on Thursday May 07, 2015 @04:21PM (#9507993)
My guess: men are likely to emigrate to any place with decent jobs (e.g. some oil state), women are probably likely to emigrate to a sex-and-the-city states.