September 1st, 1939
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world war 2 was declared in 1939 when Germany invaded Poland.
World War 2 started on 1 September 1939 when Germany invaded Poland. Britain and France then declared war on Germany on 3 September 1939.
Franklin D. Roosevelt declared war because Japan attacked Pearl Harbor.
Victory over Japan was declared : V-J Day .
it ended in 1945 so thats when peace was declared