Why were there so many displaced people after world war 2?

After World War II, millions were displaced due to the widespread destruction and upheaval caused by the conflict. The war led to the redrawing of national boundaries, resulting in significant population transfers and the expulsion of various ethnic groups. Additionally, many survivors of the Holocaust and other wartime atrocities found themselves without homes or communities to return to. The combination of these factors created one of the largest refugee crises in history, prompting international efforts to address the needs of displaced persons.