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Hint
Answer
What Is WII Known As?
Second World War
The war in Europe began in earnest on September 1, 1939 with the invasion of Poland _______ _______, and concluded on September 2, 1945, with the official surrender of the last Axis nation, Japan
Nazi Germany
The _____ economy also fell into a deep slump following World War I
"WWII started with the invasion of Poland BY Nazi Germany". Without "BY", the statement makes no sense, and has us trying to find other countries invaded at the beginning of WWII!