What were the 4 main chronological-historical phases of the Second World War?

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What were the 4 main chronological-historical phases of the Second World War?

Question Description

After reading the notes attached below give a summary about it by answering the question below

– What were the 4 main chronological-historical phases of the Second World War? What distinguished each phase and what was the historical significance of each one?

3/4 Page long.