Answer :

1. Night of Long Knives (1934)
4. Kristallnacht (1938)
3. Auschwitz opens (1940)
2. Wannsee Conference (1942)

Now a couple of these were a little hard to place, for Auschwitz, I simply put the year in which it was first operational. I've placed the years by the side of each for your reference.

Answer:

1. Night of Long Knives (1934)

4. Kristallnacht (1938)

3. Auschwitz opens (1940)

2. Wannsee Conference (1942)

Explanation:

• The Night of the Long Knives or Operation Hummingbird was a purge that took place in Germany between June 30 and July 1, 1934, when the Nazi regime, led by Adolf Hitler, carried out a series of political assassinations.

• Kristallnacht or Night of the Broken Glass, was a series of lynchings and combined attacks occurred in Nazi Germany (including Austria too) during the night of November 9 to 10, 1938 and carried out against Jewish citizens by assault troops of the SA together with the civilian population, while the German authorities observed without intervening.

• The camp of Auschwitz was a complex formed by various camps of concentration and extermination of Nazi Germany located in the Polish territories occupied during the Second World War. It included Auschwitz I - the original camp -, Auschwitz II-Birkenau - concentration and extermination camp -, Auschwitz III-Monowitz - work camp for IG Farben - and 45 other satellite camps. its opening was on May 20, 1940, until January 27, 1945.

• The Wannsee conference was the meeting of a group of civil, police and military representatives of the government of Nazi Germany on the "final solution to the Jewish question" (Endlösung der Judenfrage). The agreements taken led to the Holocaust. The conference was held on January 20, 1942 in the village Gross Wannsee number 20, located next to the lake of the same name, in the district of Wannsee, located in the southwest of Berlin.