March 1, 1941:
Himmler made his first visit to Auschwitz. He ordered Kommandant Hoess to begin massive expansion.

March 2, 1941:
Nazi Germany occupied Bulgaria.

March 18, 1941:
The last 2 weeks 600 Jews died of hunger in the Warsaw ghetto.

March 26, 1941:
The German Army High Command gave approval to Heydrich on the tasks of SS Einsatzgruppen in occupied Poland.

April 7, 1941:
Nazi Germany invaded Yugoslavia and Greece.

May 14, 1941:
3,600 Jews arrested in Paris.

June 22, 1941:
Nazi Germany invaded the Soviet Union.

In July, 1941:
As the German Army advanced, SS Einsatzgruppen conducted mass murder of Jews.

July 31, 1941:
Heydrich appointed by Hermann Goering to implement the Final Solution.

September 3, 1941:
The first test use of Zyklon-B gas at Auschwitz.

September 27, 1941:
The Babi Yar Action: more than 33,000 Jews massacred by SS Einsatzgruppen at Babi Yar outside Kiev.

October 22, 1941:
The Odessa Action: more than 30,000 Jews from Odessa murdered. Many Jews were gathered into the city square, sprayed with gasoline and burned alive.

December 7, 1941:
Japanese attacked Pearl Harbor.

December 11, 1941:
Hitler declared war on the United States.