Zardnaar
Legend
For most of history the population was capped by how much food people could grow. We've seen the explosion of population over the last century or so because of fertilizers and the industrialization of farming. Which is why in my campaign world I have relatively little farm land (in historical terms) to support the population while also limiting population growth.
Well potatoes caused a pop explosion.
Can't remember what they called it starts with M. They were concerned they couldn't feed them in 18th century iirc