While World War I was raging across the world, the Ottoman Empire attacked its Armenian minority. Millions were murdered and displaced in the Armenian Genocide.

The Holocaust is a term that describes the murder of millions of Jews and other persecuted groups across Nazi-occupied Europe in World War II.

The Holocaust was a tragedy of such scale that it defies comprehension. This collection of primary sources provides windows into the brutality—and banality—of the atrocities.

Manuel Quezon was the leader of the Philippines during the Second World War. He took in victims of the Holocaust, against critics who saw Jews as a threat to the country.

In 1935, the Nuremberg Laws showed what can happen when rulers do whatever they want. After World War II, the Allies put Nazi leaders on trial for crimes against humanity.

After the Holocaust, the world vowed to never again permit the crime of genocide. In the many decades since, genocide and mass violence have played out again, and again. Why?