True, all polygons are closed
A change over time because of the government
I think your question is: after which Genocide was this the case?
It might have been more than one genocide, but it was definitely the case in the Rwandan Genocide. Specifically it is estimated that around 100 000 children live in such households. (but his data is from 2003, so in the meantime those children grew up)
The solid, semi-solid, and liquid land of the lithosphere form layers that are physically and chemically different.
