When did World War II begin?
World War II began on September 1st, 1939 when Hitler invaded Poland.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: When did World War II begin?
### Input: 
### Response: World War II began on September 1st, 1939 when Hitler invaded Poland.</s>