Dachau opened in 1933 shortly after Hitler became chancellor. This had nothing to do with the war, there was no war at the time. Sachsenhausen opened in 1936, again before the war. Buchenwald, 1937. Flossenburg and Mauthausen, 1938. What's your reason for Hitler having Jews rounded up and put into these camps before the war?
The Wannsee Conference, 1942. Formal discussion of the Final Solution. Are you saying this never happened?
The
"Final Solution" was the code name for the systematic, deliberate, physical annihilation of the European Jews. At some still undetermined time in 1941,
Adolf Hitler authorized this European-wide scheme for mass murder. Heydrich convened the Wannsee Conference
- to inform and secure support from government ministries and other interested agencies relevant to the implementation of the “Final Solution”
- to disclose to the participants that Hitler himself had tasked Heydrich and the RSHA with coordinating the operation
The men at the table did not deliberate whether such a plan should be undertaken, but instead discussed the implementation of a policy decision that had already been made at the highest level of the Nazi regime.
https://encyclopedia.ushmm.org/content/en/article/wannsee-conference-and-the-final-solution