The answer would be Animism
When young people migrate from a rural area which probably already is suffering from a low birthrate, this effectively eventually can create a "lack of life" in a certain place where after a decade or a few decades, a certain rural area can actually die out due to not enough young people being there anymore.
Answer:
not necessarily they live all over
<span>In the Modern Era, Western Europeans colonised all parts of the continent, culminating in the Scramble for Africa in the late 19th century. A wave of decolonization followed after World War II
</span>