The Holocaust: Adolf Hitler orders the cessation of Nazi Germany's systematic T4 euthanasia program of the mentally ill and the handicapped due to protests, although killings continue for the remainder of the war.

The Holocaust, known in Hebrew as the Shoah, was the genocide of European Jews during World War II. From 1941 to 1945, Nazi Germany and its collaborators systematically murdered around six million Jews across German-occupied Europe, approximately two-thirds of Europe's Jewish population. The…