Between 1945 and 1964 there was a rise in births in many parts of the World, including Europe and America.
The reason for this was that people felt more optimistic after the war and that many men came back home and married.
We call these children Baby Boomers.
The answer that will fit best in the question above is
gentrification. It is because this is the process of having to be able to do an
improvement or do some renovating in terms of a particular thing in which is a
way of developing something into a more middle class taste.
