Germany, Britain, France, and the US have all represented themselves as women at one point so maybe there is some link between personifying a country as a woman and being a murderous imperialist.
the romans were the ones who started portraying Britainia as a woman while it was a colony
I thought the Germans portrayed their country as a man
Yeah but the Brits definitely ran with Britannia as a woman for many centuries after the Romans so I think it still counts.
As for Germany: https://en.m.wikipedia.org/wiki/Germania_(personification)