What did hitler do to prepare Germany for war?

Hitler gained control of other countries

Explanation:

Example, Czechoslovakia, Austria, Poland

Brainwashing the children

Explanation:

He basically took control of what children of Germany learned in school and brainwashed them with unreal teachings about Germany and how it was the greatest nation in the world. They also had children train for war starting at a young age by playing war games with pellet guns and fake cannons, making it fun and getting them excited for war.