Describe how population shifted during and after ww1

There are a couple of things we could talk about here,  The nation Austria-Hungary ceased to exist and split into many different nations such as you might imagine Austria and Hungary, but also Yugoslavia and Czechoslvakia, We also got Poland, Ukraine, Belarus, and a few other countries from Russia later on.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.