Hitler failed to accomplish which of the following before September 1939?

Question

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Before September 1939, Hitler had successfully accomplished the withdrawals from the Treaty of Versailles in 1935, remilitarization of the Rhineland in 1936, anschluss with Austria in 1938, and annexation of Czechoslovakia's Sudetenland in 1938. However, he had failed to secure concessions from Poland regarding the Corridor and Danzig, which ultimately led to the outbreak of World War II.

Hitler Failed to Accomplish Which of the Following Before September