Which action of Hitler’s began to erode German domination of Europe?

Question

Responses

He got into a trade war with the United States.
He got into a trade war with the United States.

He refused to negotiate peace with Britain.
He refused to negotiate peace with Britain.

He began a mass genocide of the Jews.
He began a mass genocide of the Jews.

He invaded the Soviet Union.

Answer 1

He invaded the Soviet Union.