Here are some facts to help you to choose which area to research:
Civilians across the globe

During World War II, more civilians died than soldiers

Across the globe, innocent people were imprisoned, starved, tortured
and murdered

The effects of Hiroshima, the Holocaust or of Prisoner of War camps

New borders were drawn by the Allies, leaving many living within
them in hostile territory

At the end of the war, millions of refugees were homeless

At the end of the war, the European economy had collapsed

Most of the European industrial infrastructure was destroyed and entire
Politics
towns and cities devastated

Some old colonies gained more independence

Leaders were now chosen for different reasons than before the war

The UN was formed and in Britain, the Welfare State developed

Rationing, conscription, evacuation and propaganda were some of the
methods that governments used to protect the population and to help
achieve their objectives, but were these always for the best?
Life in Britain

Shortages in food, clothing and other necessities

Technology had not moved on in over six years

Entire towns were devastated, many people were homeless

Some rationing continued until 1954

Women now working, not necessarily wanting to give up after the war

Conscription and the break-up of families

The effects of evacuation

Propaganda and censorship – did this keep up morale or did people feel
that they were being patronised?