Would that ever put the breaks on population growth - there would be a 4/1 male/female ratio within a generation.
I recently read that China has had a 13/10 male/female ratio for some time now and the results are higher crime, higher incidents of violence, more rapes and more molestation, more homosexuality. The report, if I recall correctly, was in the South China Morning Post (Hong Kong), April, 2005.
What population growth? The U.S. is already experiencing native population decline and the U.N. currently projects that the global population will be decreasing by about 2050. The "Population Explosion" was a lie put forth by racist eugenicists.