ELI5: Explain Like I'm 5

Demographic history of Bačka

Okay kiddo, have you ever wondered how many people used to live in a certain place a long time ago? That's what we call its demographic history.
So, let's talk about Bačka, a region located in Serbia. A very long time ago, there were only a few people living there, mostly farmers who worked on the land and took care of their animals.
But as time passed and things changed, more and more people started moving to Bačka. Some of these people were different from the ones who already lived there, like the Hungarians who moved there from other places.
As a result, the demographics (which means the kinds of people) of Bačka changed over time. There were also events that made even more people move to Bačka, like when certain groups of people were forced to leave their homes and move somewhere else.
But even with all of these changes, people still live in Bačka today and their demographic history is just a part of what makes the region the way it is.