•  1940s: The Nazis murder approximately six million Jews, in a genocide that comes to be known as the Holocaust, in extermination camps in Germany and its allied countries.

•  1950s: In the United States and other countries to which Jews immigrate after World War II, the Holocaust is not much discussed either within or outside Jewish circles. Jews who survive the Holocaust and immigrate to the United States are discouraged by customs officials from talking about their experiences, on the presumption that Americans are not interested.

•  Today: The Holocaust is the subject of documentaries, films, and books and is commemorated in museums and monuments. Holocaust denial is illegal in many countries.

•  1940s: The Holocaust destroys all Hasidic groups in Eastern Europe.

•  1950s: Survivors of the Holocaust immigrate to various countries...