The 20-page document from the U.S. Naval Intelligence Office to Franklin Delano Roosevelt appears in a new book December 1941: 31 Days that Changed America and Saved the World
The memo read: 'In anticipation of open conflict with this country, Japan is vigorously utilizing every available agency to secure military, naval and commercial information, paying particular attention to the West Coast, the Panama Canal and the Territory of Hawaii.'
It also mentioned how the Japanese were bolstering their spy network and collecting ‘technical information’ for use by its Navy.
More than 2,000 Americans were killed on December 7, 1941, in the surprise attack by hundreds of Japanese war planes.
It was seen as way to avoid U.S. interference with Japanese military might in the Pacific - and Japan's potential plans to invade the Philippines.
President Roosevelt called the date one that will 'live in infamy,' and the attack itself propelled the U.S. right into World War II.
But Roosevelt was often criticized for letting too much prior information of the impending attack slip through the cracks.
December 1941’s author Craig Shirley, told USNews.com that there were ‘so many mistakes through so many levels of Washington.’
But despite those points, Shirley told the website that it doesn’t necessarily mean that President Roosevelt dropped the ball – just that ‘there were more pieces to the puzzle.’
His book even provides a comparison of the way the Bush administration handled information leading up to the September 11 attacks.
Mr Shirley said: ‘Some things never change.’
The book also reveals how FDR and his war cabinet considered the option of declaring war on all three axis powers (Germany, Italy and Japan) on the night of the Pearl Harbor attack.
In the end, the United States only went with Japan, citing the idea of isolationism and the nation’s weariness from World War I.
The U.S. would, however, declare war on Germany and Italy later on December 11.
The bombing of Pearl Harbor would remain the worst loss of American life in a single strike until the September 11 atrocities - 70 years later. - dailymail
Three days before the Dec. 7, 1941 Japanese attack on Pearl Harbor, President Roosevelt was warned in a memo from naval intelligence that Tokyo's military and spy network was focused on Hawaii, a new and eerie reminder of FDR's failure to act on a basket load of tips that war was near.
In the newly revealed 20-page memo from FDR's declassified FBI file, the Office of Naval Intelligence on December 4 warned, "In anticipation of open conflict with this country, Japan is vigorously utilizing every available agency to secure military, naval and commercial information, paying particular attention to the West Coast, the Panama Canal and the Territory of Hawaii."
The memo, published in the new book December 1941: 31 Days that Changed America and Saved the Worldwent on to say that the Japanese were collecting "detailed technical information" that would be specifically used by its navy. To collect and analyze information, they were building a network of spies through their U.S. embassies and consulates.
Historian and acclaimed Reagan biographer Craig Shirley, author of the just released December 1941, doesn't blame FDR for blowing it, but instead tells Whispers that it "does suggest that there were more pieces to the puzzle" that the administration missed. The 70th anniversary of the attack is next month.
In fact, he compares the missed signals leading up to Japan's attack to 9/11, which government investigations also show that the Clinton and Bush administrations missed clear signals that an attack was coming.
"So many mistakes through so many levels of Washington," said Shirley. "Some things never change."
His book also reveals another blockbuster historical moment: On the night of the Pearl Harbor attack, FDR and his war cabinet considered declaring war on all three Axis Powers—Japan, Germany, Italy—but in the end the president only targeted Japan. At the time, the U.S. was still healing from World War I and isolationism was the word of the day.
Shirley, aided by son Andrew as his chief researcher, takes a new tack in his book about Pearl Harbor. Instead of just writing how it all went down, his book attempts to give readers a feel for how the country felt 70 years ago. He accomplishes that by providing anecdotal information from nearly 2,000 newspapers and magazines.
"The goal here," Shirley writes in the preface, "is to make the reader feel as if they are experiencing the day to day events as they unfolded. Some historians don't like to go into the arduous tasks of going through thousands of newspapers preferring instead to rely on those bits and pieces of news reporting they may glean from other books. I did, and consequently the reader will find stories and information from the month of December 1941 they have never heard before." - usnews
December 1941: 31 Days that Changed America and Saved the World
Pearl Harbor (Two-Disc 60th Anniversary Commemorative Edition)
Tora! Tora! Tora! (Two-Disc Collector's Edition)
National Geographic - Pearl Harbor: Legacy of Attack
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