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My understanding was the Japanese did not press their attack because the fact the U.S. Carriers were not present at Pearl Harbor, the Japanese High Command became very Nervous for their own fleet Carriers and decided discretion was the better part of valor and they withdrew rather than chance our carriers finding them while their Aircraft where at Pearl Harbor!

My great Uncle Robert Herriott is interred aboard the Arizona!
I have read alot about Pearl Harbor, the circumstances prior to the attack, I believe FDR knew something was coming but wanted the U.S. in the War and purposely allowed U.S. Bases to be relaxed, he should have had outlying bases at Alert Status but simply didn't!