system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come there are far more patriarchies than matriarchies

So, pretty much title. Mostly all European contries since the middle ages and going far back had patriarchic tendencies. First born son being the heir, regents mostly being male, women not being allowed to vote and so on. 

But where does this come from? Even considering "biological differences", from a biological standpoint, both males and females are equally necessary in any society, human or animal. 

Couldn't it easily have been the other way around and it was just some kind of snowball effect that led to a mostly patriarchic society?
gpt
On average, men are physically stronger than women. And women become pregnant and give birth, which is of course quite disabling. Those things together would be sufficient to get  men into leadership roles back when physical aptitude was the primary decider of power.

And from there, tradition took over.