Explain the historical circumstances that led to the invasion of Poland in 1939

Hitler went on to negotiate a nonaggression pact with the Soviet Union. The German-Soviet Pact of August 1939, which secretly stated that Poland was to be partitioned between the two powers, enabled Germany to attack Poland without the fear of Soviet intervention

Explanation:

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".