Illegal construction
Illegal building can be the consequence of a combination of urbanization , overpopulation , homelessness and poverty in which case expanding slums , Shanty towns or similar will result . 
<triplet> homelessness <subj> poverty <obj> has cause <triplet> slums <subj> Shanty town <obj> partially coincident with <triplet> Shanty town <subj> slums <obj> partially coincident with