I dont think this has to do with civil wars and instability, because even the Balkans went through civil war yet this this doesnt happen.The men are the one who set the value of their women. So if they're cheap, it's because we made them cheap. Who's the one who gives the girl for marriage?
Civil wars, instability,and no father in her life, can make them really cheap.
More so recently iraqis and syrians went through hell which Somalis didn’t, they outnumber the somalis in the west yet they don’t offer women for rewarding price.
So what would be your explanation since it’s not war that causes this.