Only the Jew knew that by an able and persistent use of propaganda heaven itself can be presented to the people as if it were hell and, vice versa, the most miserable kind of life can be presented as if it were paradise. The Jew knew this and acted accordingly. But the German, or rather his Government, did not have the slightest suspicion of it. During the War the heaviest of penalties had to be paid for that ignorance.

-- Mein Kampf, Chapter 10”
― Adolf Hitler, Mein Kampf

This is an excerpt from Hitler's ideological text Mein Kampf, in this section, his resentment towards the Jewish people can obviously be seen. But how does he tie the Jewish people to the First World War, and how does he blame them for German failures?

Please, I’m in a hurry