Suburbanization of more developed countries is due to

desire to change lifestyle

Explanation:

Compared to the cities, the suburb tend to be less hectic, lower crime rate and have lower rate of pollution. As people grow older, people tend to be less tolerable of these negative characteristics of the cities.

Because of this, they tend to developed the desire to change their lifestyle and move to the suburban area in order to get it.

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.