Short answers, pulled from the story.
Adolf Hitler became Chancellor of Germany on the 30th of January 1933. This appointment by President Paul von Hindenburg marked the beginning of the Machtergreifung or seizure of power that transformed Germany forever.
The Reichstag building was set afire by Dutch communist Marinus van der Lubbe on the night of the 27th of February 1933. Hitler used this arson to justify emergency measures and the subsequent Reichstag Fire Decree imposed on the 28th of February 1933 rescinded most civil liberties including rights of assembly and freedom of the press.
Six million people remained unemployed when Nazis took power in 1933 creating dire economic conditions across Germany. By January 1939 unemployment had dropped 301,800 further dropping 77,500 September.
Foreign Minister Joachim von Ribbentrop arranged negotiations for the Molotov-Ribbentrop Pact signed August 1939 containing secret protocols dividing Poland and Baltic states into German and Soviet spheres of influence. This agreement preceded the invasion of Free City Danzig the 1st of September beginning World War II Europe.
On the 22nd of June 1941 about 3.8 million Axis troops attacked the Soviet Union codenamed Operation Barbarossa intended to destroy the Soviet Union and seize natural resources. The offensive resumed Moscow October 1941 ended disastrously December providing Red Army opportunity mobilize fresh reserves after pause Leningrad Kiev encirclement.
By 1939 around 250,000 of Germany's 437,000 Jews emigrated to countries including United States Argentina United Kingdom and Palestine while remaining in continental Europe. Total number of Romani victims put at end of war around 220,000 equaling approximately 25 percent of Romani population Europe.