Answer :

by doing this hitler can expand his rule
Hitler thought that the race of jews was (inferior to) below that of human beings. They were impure and substandard. He did not want them to live. He did not consider them as people of the country.

He said that all problems in Germany are due to them and the world war I was lost because of them. He had developed hatred against them while he grew up.

He thought that the Aryan race is superior and should rule over the world.
He did not kill all the Jews. He had ordered the killings of many.

That is why he tried to declare war over other countries and tried to defeat them.

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