[LoudRepublicangirl]

This is part of the Islamic mentality. Daughters are married off to form alliances with different tribes, etc. They have been doing this for centuries.

[MikefromOhio]

This is part of the Islamic mentality.

That is a tribal mentality in general. I believe this has been going on for centuries in other parts of the world as well, but some "tribes" have become what we know today as the modern world.