All Male Elves
Once upon a time there was a man. Completely regular man. No-one can remember what he did to gain the wish. Some say that he helped the gods. Some say that he stole the wish. Some say that he was just lucky. One thing is certain though, the wish. He got it. He used it and so the elves were born. Strong, beautiful, long living, but all male, as the man had asked the gods to grant him sons better than anyone else's.
At first this hardly seemed a problem as the world was full of other people. Plenty of females were still born and the elves still few, so almost no-one foresaw the problem that was ahead of them. But as the generations passed on and the elves got more common the problems begun and the unbalanced distribution of sexes started to cause bad blood amongst the elves and common folk, and so the on going war between the elves and common folk begun.
It was a very simple but brutal solution to the problem, as the slaughter balanced the unbalanced distribution of sexes. But then the another problem arise. The world's resources were limited. As the population of elves grew and common folk declined not enough females were born to support the next generation of the both population. So the new culuture amongst the elves was born, and people were limited on having only one child, as they could not afford on having the population to grow any more.
The one child policy worked and the population of elves started to slowly decline, since even amongst them not everyone made it to the age of reproduction nor were they interested in having children. Even if this new policy had helped to forge a peace between the common folk and elves the elves did not wish to let their society to decline too much, so to keep the population from declining too much, the leaders of the elves started to grant permissions for valued members of their society the permission to have another child.

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