M - Motive, the message the source is trying to convey
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P - Perspective, whose perspective is the source coming from?
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O- Origin, Author?
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R - Reliability, is the source bias?
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U - Usefulness, is the source useful to a historian?
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Japanese surprise attack on the US Navy base on Pearl Harbor, Hawaii, 7th December 1941
This event led to America's entry into World War II as they declared war on Japan three days later.
The Japanese attacked the American naval fleet at Pearl Harbor, Hawaii, destroying eight battleships and killing over 200 Americans.
The Japanese had been planning this attack since November 1940 when their navy minister ordered his staff to draw up plans for an attack on American naval bases in the Pacific Ocean.