Many of us even go here and there for educational purposes, take our degrees and most of the time wanna Go-Home and get settled. May be that’s kinda emotion which attracts everyone back to their hometown.
Our most of the things like house, area, colonisation makes more safer than the new area and new peeps. Most of the things are already settled so why you start from the scratch. That’s what most of them think.
Obviously there could be many more theories out their but this could be one of the reason for concentrated colonisation.
In short, people find a HOME. Home is where the heart is. Family members stay close together and are not open to moving away from thier family because we look after each other. Latins and Asians I believe have this culture. A familiar place where everybody knows everyone is what we are used to.
Starting from scratch are from new families traveling to find greener pastures but eventually, if they don't come back, they import someone from their hometown with them. It could be a sister, grandparents or so.
Home is where the heart is, that's absolutely correct.
Our culture is always family first, but in terms of finding a way to survive financially, my country men slowly adapt on a character trait that sacrifice his presence for his family and travel abroad to have a more sustainable income.
But still majority of us here doesn't like to move from a place where we were born.
One thing noticeable in our culture is that we tend to move to other country to find good income salary, but foreigners like Westerner and Chinese people come to our country to build a business. This is something most people in my country doesn't realize and have overlooked.