Settlements change for many reasons. Read the following story about Delhi.

The city of Delhi can claim to have been central to many empires that ruled
India. When India gained independence, the city remained its capital. Over the
decades, the city has attracted people from all parts of India as they migrated
in search of livelihood, jobs, education, dispensary etc. As the capital of the
country, with the Parliament and Central Government offices, there are people
from all parts living in the city. Because of this, the population increased
eight fold from 60 lakhs to 1 crore and 60 lakhs.

Every city usually has a master plan to design and allocate different types of
areas. In any city, there should be housing areas, markets, schools, industrial
areas, office areas, parks and recreational areas and so on. Based on this,
planners can decide the types of roads, the amount of water or electricity
required, how to dispose waste, how to clean sewage etc that would be necessary.
The city of Delhi had three such master plans. However, if we look at the
current scenario, it would appear that these plans have not been implemented
properly. In fact, Delhi has grown in an unplanned manner. A planned colony
usually has all the facilities in place. Government has to announce areas
demarcated for different purposes. The constructions in that area are expected to
follow such an order. However, it is clear that such plans have not been
followed.

On one hand, there is growing population in the cities and on the other hand,
there is long delay in planning and announcing how the areas are to be used.
People who migrate to the city looking for work, occupy land and settles, after
that without necessary permission and build on it in the way they can afford with
no help or facility from anyone. They remain unauthorised for long periods. When
the plan is finally announced, these areas may be marked for a different purpose.

This leads to a difficult conflict situation. People face constant threat of
eviction. They seek political patronage from being evicted from their homes.
These colonies are not likely to be recognised because the master plan ignored