I am not sure about the copyright, the one my colleague had didn't relate specifically to an area and was just the general facts.

I am sure there will be plenty of literature available that could be adapted

Regarding 1, I suppose men in lots of places are the main bread winners and are seen as the most likely to be able to get work in the new country, they would then bring the family over when settled.

Men are also the most likely to be conscripted and have to face the consequences if they object. Poltical Instability would make males more vulnerable.

Men would also be seen as most likely to cope with a dangerous journey.