Question

what serious mistake did Hitler make when he attacked the Soviet Union​

Answer 1

Answer:

Racial policies of Nazi Germany. As early as 1925, Adolf Hitler vaguely declared in his political manifesto and autobiography Mein Kampf that he would invade the Soviet Union, asserting that the German people needed to secure Lebensraum ("living space") to ensure the survival of Germany for generations to come.

Explanation:

Answer 2

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Operation Sea Lion was a failure, so Hitler turned his attention toward the Soviet Union. This decision saved G.B. and also proved to be Hitler's costliest mistake. In June 1941, Germany launched Operation Barbarossa- the invasion and conquest of the Soviet Union.